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NCERT exemplar Class 9 Science solutions chapter 7 deals with the understanding of diversity in living organisms. These NCERT exemplar Class 9 Science chapter 7 solutions are prepared by our subject matter experts in Biology and are designed to provide a detailed explanation to all the questions posted in NCERT Class 9 Science.
These Class 9 Science NCERT exemplar chapter 7 solutions provide the students with step by step approach to enhance their learning capabilities. The NCERT exemplar Class 9 Science solutions chapter 7 follows the prescribed syllabus of the CBSE Syllabus for Class 9.
Question:1
Find out incorrect sentence
(a) Protista includes unicellular eukaryotic organisms
(b) Whittaker considered cell structure, mode and source of nutrition for classifying the organisms in five kingdoms
(c) Both Monera and Protista may be autotrophic and heterotrophic
(d) Monerans have well defined nucleus
Answer- (d)
Solution: R. H. Whittaker gave the five-kingdom classification that includes monera, protists, fungi, plants and animals. The kingdom Monera consists of unicellular, prokaryotic organsisms and is the most primitive group. They do not contain well-defined nucleus and cell organelles are absent.
The correct answer is d)- Monerans have a well-defined nucleus
Question:2
Which among the following has specialised tissue for conduction of water?
(i) Thallophyta
(ii) Bryophyta
(iii) Pteridophyta
(iv) Gymnosperms
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer- (c)
Solution: The plant body of Thallophytes and Bryophytes is not differentiated into root, stem and leaves. The vascular bundles are absent in them.
Xylem is the true vascular bundle, a characteristic feature of land plants that include the Pteridophytes, Gymnosperms and Angiosperms, and helps in conducting water and minerals to the leaves from the soil.
Xylem and Phloem are found in Pteridophytes and they are further evolved in Gymnosperms and Angiosperms.
The correct answer is- c) 'iii and iv'
Question:3
Which among the following produce seeds?
(a) Thallophyta
(b) Bryophyta
(c) Pteridophyta
(d) Gymnosperms
Answer- (d)
Solution- Gymnosperms do not produce flowers. The male and female gametophytes are present in the sporophyte. They produce seeds which are not present inside an ovary and are called as naked seeds. In bryophytes and pteridophytes, zygote produces sporophyte and there is no seed formation. In thallophyte, reproduction is mainly asexual and when sexual it is isogamous, anisogamous or oogamous.
The correct answer is d)- Gymnosperms
Question:4
Which one is a true fish?
(a) Jellyfish
(b) Starfish
(c) Dogfish
(d) Silverfish
Answer- (c)
Solution: Jellyfish belongs to phylum Cnideria, silverfish belongs to phylum Arthopoda and starfish belongs to phylum Echinodermata. Dogfish comes under class Chondrichthyes of class Pisces. They have streamlined body with scales and have cartilaginous skeleton.
The correct answer is c)- Dogfish.
Question:5
Which among the following is exclusively marine?
(a) Porifera
(b) Echinodermata
(c) Mollusca
(d) Pisces
Answer- (b)
Solution- Echinodermata have a water vascular system. Example- Starfish. They are marine animals.
Porifera lives in both saltwater and fresh water e.g., Haliciona and Spongilla.
Mollusca can live on the rocky shore, freshwater, saltwater, etc. Pisces can be freshwater or saltwater.
Thus, the correct answer is b)- Echinodermata.
Question:6
Which among the following have open circulatory system?
(i) Arthropoda
(ii) Mollusca
(iii) Annelida
(iv) Coelenterata
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) and (iv)
Answer- (a)
Solution: The open circulatory systems pump blood into a cavity called hemocoel with the blood diffusing back to the circulatory system between cells. This system lacks a true heart or capillarie E.g., Molluscs and Arthropods.
Annelida and Coelenterata have closed circulatory system.
The correct answer is a)- (i) and (ii)
Question:7
In which group of animals, coelom is filled with blood?
(a) Arthropoda
(b) Annelida
(c) Nematoda
(d) Echinodermata
Answer- (a)
Solution- Annelida, Nematoda and Echinodermata don’t have blood and Arthropods coelom is filled with blood.
Annelids, arthropods and molluscs contain coelom that is a fluid-filled cavity present between the gut and mesoderm. The coelom of arthropods is filled with blood called as hemocoel. The circulating fluid in these organisms is called as hemolymph.
The correct answer is a)- Arthropoda
Question:8
Elephantiasis is caused by
(a) Wuchereria
(b) Pinworm
(c) Planarians
(d) Liver flukes
Answer is (a) Wuchereria
Solution- Wuchereria bancrofti is a filarial worm, a human parasite that causes Elephantiasis. This condition is also known as Filariasis and is transmitted to humans through mosquitoes. The effects of the disease is swelling of the limbs, genital areas, breasts etc
Pinworm is a common intestinal parasite and causes Enterobiasis. Planarians are non-parasitic flatworms. Liver flukes are flatworms that cause liver rot in humans.
The correct answer is- a) Wucherreria.
Question:9
Which one is the most striking or (common) character of the vertebrates?
(a) Presence of notochord
(b) Presence of triploblastic condition
(c) Presence of gill pouches
(d) Presence of coelom
Answer- (a)
Solution- Kingdom Animalia are divided into chordates and non-chordates on the basis of presence or absence of notochord. The presence of triploblastic condition, presence of gill pouches and coelom is found in both vertebrates and invertebrates but Notochord is present only in invertebrates.
The correct answer is – a) Presence of notochord
Question:10
Which among the following have scales?
(i) Amphibians
(ii) Pisces
(iii) Reptiles
(iv) Mammals
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iii)
(d) (i) and (ii)
Answer-(c)
Solution: The body of amphibians do not contain scales on their body and their skin is permeable to allow the diffusion of gases.
The body of reptiles are covered with scales and have tough skin that provides them an adaptation in the extreme climate.
Fish have dermal scales while reptiles have horny epidermal scales.
The correct answer is –c) (ii) and (iii).
Question:11
Find out the false statement
(a) Aves are warm blooded, egg laying and have four chambered heart
(b) Aves have feather covered body, fore limbs are modified as wing and breathe through lungs
(c) Most of the mammals are viviparous
(d) Fishes, amphibians and reptiles are oviparous
Answer- (d)
Solution- The members of bony fishes are oviparous or viviparous while mammals are viviparous and cartiliganious fishes, reptiles and amphibians are oviparous. Aves are also oviparous. They have four chambered heart filled with warm blood, body, covered with feathers, respiration by lungs and forelimbs modified into wings.
The correct answer is d)- Fishes, amphibians and reptiles are oviparous
Question:12
Pteridophyta do not have
(a) root
(b) stem
(c) flowers
(d) leaves
Answer- (c)
Solution- Pteridophytes are vascular plants. They consists around 12,000 species of vascular plants that reproduce via spores and have neither seeds nor flowers, e.g., fern. The difference between pteridophytes and mosses is the presence of vascular vessels.
The correct answer is- c) flowers
Question:13
Identify a member of porifera
(a) Spongilla
(b) Euglena
(c) Penicillium
(d) Hydra
Answer: (a)
Solution- Spongilla is a freshwater sponge and belongs to the family Spongillidae. They are found in lakes and streams. They belong to the phylum Porifera and consists of multicellular, unspecialized cells that can transform into other types.
Euglena is a unicellular organism and belongs to kingdom Protista. Penicillium is a fungus and bears spores.
Hydra is a Coelenterata and a small, simple, radially symmetrical fresh-water animal.
Thus, the correct answer is a)- Spongilla
Question:14
Which is not an aquatic animal?
(a) Hydra
(b) Jelly fish
(c) Corals
(d) Filaria
Answer- (d)
Solution- Hydra, jelly fish, corals are aquatic animals that live in water. Thus, they are called as aquatic animals. Roundworm is a nematode parasite found in both aquatic as well as terrestrial animals.
Filaria is a disease caused by Wuchereria and trasnmitted to humans through mosquitoes.
The correct answer is d)- Filaria.
Question:15
Amphibians do not have the following
(a) Three chambered heart
(b) Gills or lungs
(c) Scales
(d) Mucus glands
Answer- (c)
Solution- Amphibians are the organisms that live on both land and water. They have 3 chambered heart (2 auricles and 1 ventricle). They contain mucus glands which makes their body slimy. Gills and lungs are present for respiration. They do not contain scales.
The correct answer is- c) Scales
Question:16
Organisms without nucleus and cell organelles belong to
(i) fungi
(ii) protista
(iii) cyano bacteria
(iv) archae bacteria
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)
Answer- (b)
Solution- Prokaryotes are the unicellular organisms e.g., Cyanobacteria and Archaebacteria. They belong to kingdom Monera. These organisms do not have a well-developed nucleus, nuclear membrane and cell organelles like mitochondria, etc. Fungi and protists are eukaryotes with nucleus and well-developed cellular organelles.
Thus, the correct answer is b)- (iii) and (iv)
Question:17
Which of the following is not a criterion for classification of living organisms?
(a) Body design of the organism
(b) Ability to produce one’s own food
(c) Membrane bound nucleus and cell organelles
(d) Height of the plant
Answer- (d)
Solution- Living organisms are classified on different criteria like- nature of cell, number of cells, mode of nutrition, body design, presence or absence of nucleus, presence of conducting tissue etc. The height of a plant is not considered as criterion for classification of organisms.
The correct answer is- d) height of the plant
Question:18
The feature that is not a characteristic of protochordata?
(a) Presence of notochord
(b) Bilateral symmetry and coelom
(c) Jointed legs
(d) Presence of circulatory system
Answer- (c)
Arthropods consists of jointed legs. It includes most of the insects. Protochordata are invertebrates, marine animals. They are triploblastic with the bilaterally symmetric body and coelom. They have notochord at some stage of life.
The correct answer is- c) jointed legs.
Question:19
The locomotory organs of Echinodermata are
(a) tube feet
(b) muscular feet
(c) jointed legs
(d) parapodia
Answer- (a)
Solution- Echinodermata consists of a water vascular system. They contain complex system of water-containing tubes and bladders which pass through pores in the skeleton. These tubes look like feet from outside and they also help in locomotion, exchange of gases and feeding.
The correct answer is a)- 'Tube feet'.
Question:20
Corals are-
(a) Poriferans attached to some solid support
(b) Cnidarians, that are solitary living
(c) Poriferans present at the sea bed
(d) Cnidarians that live in colonies
Answer-(d)
Solution- Corals belong to phylum Cnidaria. They are marine invertebrates and live in colonies of identical polyps held together by calcium carbonate. The coral reefs have inhabited the oceans and secrete calcium carbonate to form a hard skeleton.
The correct answer is- d) Cnidarians that live in colonies
Question:21
Who introduced the system of scientific nomenclature of organisms?
(a) Robert Whittaker
(b) Carolus Linnaeus
(c) Robert Hooke
(d) Ernst Haeckel
Answer- (b)
Solution-
Carolus Linnaeus introduced the scientific sytem of naming organisms called as binomial nomenclature. It is a simplified method. Binomial nomenclature gives each organism a scientific name that has two parts. The first part is a Genus and the second part is Species. It is always written in Italics.
The correct answer is b)- Carolus Linnaeus
Question:22
Two chambered heart occurs in
(a) crocodiles
(b) fish
(c) aves
(d) amphibians
Answer - (b)
Solution:
Crocodile and aves have 4-chambered heart while amphibians have 3 chambered heart. Fishes have two chambered heart- one auricle and one ventricle. Auricle is responsible for taking in blood from body and ventricle pumps out the blood that has entered the heart through gills and give fresh oxygen to the blood.
The correct answer is b)- fish
Question:23
Skeleton is made entirely of cartilage in
(a) Sharks
(b) Tuna
(c) Rohu
(d) None of these
Answer- (a)
Solution:
The skeleton of cartilaginous fish is made up of cartilage. They are also called as Osteichthyes
e.g., Sharks whereas Tuna and Rohu are bony fishes with a bony structure. They are also called as Chondrichthyes
The correct answer is- a)- Sharks
Question:24
One of the following is not an Annelid
(a) Nereis
(b) Earthworm
(c) Leech
(d) Urchins
Answer-(d)
Solution- Nereis, earthworm and leech belong to phylum Annelida. It is a group of animals having segmented body without spines and their body surface is covered with cuticles
Urchin belongs to phylum Echinodermata. It is a marine animal with globe like shape and radial symmetry. Its body is covered with long spines for protection.
The correct answer is- d) Urchins.
Question:25
The book Systema Naturae was written by
(a) Linnaeus
(b) Haeckel
(c) Whittaker
(d) Robert Brown
Answer- (a)
Solution- Carolus Linnaeus wrote the book 'Systema Naturae'. It was one of his major works. He introduced the system of naming organisms- binomial nomenclature. Its first edition was published in 1735.
Haeckel coined the term -ecology.
Whittaker proposed the five-kingdom classification i.e., Monera, Protista, Fungi, Plantae and animalia.
Robert Brown discovered the nucleus in the cell.
The correct option is- a) Linnaeus
Question:26
Karl Von Linne was involved with which branch of science?
(a) Morphology
(b) Taxonomy
(c) Physiology
(d) Medicine
Answer- (b)
Solution- Karl Von Linne is also known as Carl Linnaeus. He made significant contributions to the naming and classification of living organisms and proposed the binomial system of nomenclature which is a formal system of naming living organisms. It consists of 2 parts- the first part is Genus and second part is Species. It is always written in italics.
The correct answer is- b)- Taxonomy.
Question:27
Real organs are absent in
(a) Mollusca
(b) Coelenterata
(c) Arthropoda
(d) Echinodermata
Answer- (b)
Solution- Coelenterates have tissue level organization and they lack real organs. They are multicellular, diploblastic and acoelomate animals with radial symmetry. They may be freshwater or marine.
Mollusca, Arthropoda and Echinodermata have organ level of organisation.
The correct answer is b) Coelenterata
Question:28
Hard calcium carbonate structures are used as skeleton by
(a) Echinodermata
(b) Protochordata
(c) Arthropoda
(d) Nematoda
Answer- (a)
Solution- Sea urchin belongs to phylum Echinodermata. These are spiny skinned organisms found in marine water. They are triploblastic and have a coelomic cavity. They produce calcium carbonate plates that fit together tightly.
The correct answer is- a)- Echinodermata
Question:29
Differentiation in segmental fashion occurs in
(a) Leech
(b) Starfish
(c) Snails
(d) Ascaris
Answer is (a) Leech
Solution- Leech is a member of Annelida phylum. Their body surface is divided into segments that are identical to each other and they contain a set of organis in each segment. Their body is also covered with cuticles. Starfish belongs to Echinodermata and snail belongs to Mollusca.
The correct answer is- a)- Leech
Question:30
In taxonomic hierarchy family comes between
(a) Class and Order
(b) Order and Genus
(c) Genus and Species
(d) Division and Class
Answer- (b)
Solution: The living organisms are arranged in the following hierarchy:
Species ---- Genus ---- Family ---- Order ---- Class ---- Phylum ---- Kingdom
The correct option is (b)- Order and Genus
Question:31
5-Kingdom classification has given by
(a) Morgan
(b) R. Whittaker
(c) Linnaeus
(d) Haeckel
Answer is (b)
Solution- R. Whittaker gave 5-kingdom classification. It includes Monera, Protista, Fungi, Plantae and Animalia. This classification was based on cell structure, cellular organisation, mode of nutrition etc.
The correct option is- (b) R. Whittaker
Question:32
Well defined nucleus is absent in
(a) blue green algae
(b) diatoms
(c) algae
(d) yeast
Answer-(a)
Solution- Diatoms are also known as phytoplanktons with secondary chloroplasts derived from an endosymbiotic red alga. Algae is an eukaryotic organism. It consists of the microscopic unicellular Chlorella and the diatoms to multicellular kelps, the large brown alga. Yeast is a eukaryotic organism belonging to the kingdom Fungi. Blue-green algae or Cyanobacteria is the most primitive photosynthetic bacteria. These are unicellular and do not contain any well-defined nucleus.
Hence, the correct answer is a)- blue green algae
Question:33
The ‘Origin of Species’ is written by
(a) Linnaeus
(b) Darwin
(c) Hackel
(d) Whittaker
Answer- (b)
Solution-
‘Origin of Species' is a work of scientific literature by Charles Darwin. It was published on 24th November 185. The full title of the book was 'On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life'.
The correct answer is (b)- Darwin.
Question:34
Meena and Hari observed an animal in their garden. Hari called it an insect while Meena said it was an earthworm. Choose the character from the following which confirms that it is an insect.
(a) Bilateral symmetrical body
(b) Body with jointed legs
(c) Cylindrical body
(d) Body with little segmentation
Answer is (b) Body with jointed legs
Solution:
Arthropoda consists of insects that make up around 75% of the phylum Arthropoda. They can live in different habitats and can crawly, fly, jump and swim. Arthropoda has been derived from a Greek word- arthron meaning 'joint' and pous meaning 'foot'. Hence, insects are basically animals with jointed legs.
The correct answer is- b)- 'Body with jointed legs’.
Question:35
a-True- The 5 kingdom classification given by Whittaker is the most accepted one.
b- True- Monera consists of unicellular, prokaryotic organisms.
c- False- Genus comes before the species according to the Linnaeus system.
d-True- It is a genus of the cyanobacteria which belongs to kingdom Monera.
e-False- They obtain their energy by the process of photosynthesis.
f- True- all the prokaryotes i.e., bacteria and blue green algae belongs to kingdom-Monera.
Question:36
Fungi shows Saprophytic mode of nutrition.
Cell wall of fungi is made up of Chitin.
Association between blue green algae and fungi is called as Lichens.
Chemical nature of chitin is Carbohydrate.
Species has the smallest number of organisms with a maximum number of similar characters.
Plants without well-differentiated stem, root and leaf are kept in Thallophyta.
Bryophytes are called amphibians of the plant kingdom.
Question:37
Monocot consists of one seed leaf inside the seed coat. Dicots have two seed leaves inside the seed coat.
Gram-Dicot
Wheat-Monocot
Rice- Monocot
Pumpkin- Dicot
Maize- Monocot
Pea—Dicot
Question:38
B, b- A, c- D, d-C, e-F, f-E, g-G
Sol.
Naked seed – Gymnosperm is a type of phanerogams and bear naked seeds.
Covered seed – Angiosperm have seeds present inside their fruits.
Flagella – Euglena is a eukaryotic, autotrophic organism that has cilia or flagella present on it.
Marchantia – Bryophytes like Marchantia has a well-developed plant body without specialized vascular tissues.
Marsilea – Pteridophyta like Marsilea has a well-developed plant body with specialized vascular tissues.
Cladophora – Thallophyta like Cladophora does not have a well-differentiated plant body.
Penicillium – Fungi like Penicillium is a heterotrophic eukaryotic organism.
Question:39
Match items of column (A) with items of column (B)
(A) (B)
(a) Pore bearing animals (A) Arthropoda
(b) Diploblastic (B) Coelenterata
(c) Metameric segmentation (C) Porifera
(d) Jointed legs (D) Echinodermata
(e) Soft bodied animals (E) Mollusca
(f) Spiny skinned animals (F) Annelida
Answer-
a-C, b-B, c-C, d-A, e-E, f-F
Sol.
Porifera- These animals have pores all over the body, which helps to circulate the water throughout the body and brings food and oxygen.
Coelenterata- They are diploblastic animals and their body is made up of two layers- one layer makes up cells on the outside of the body and other makes up the inner lining of the body.
Annelida- This group of animals show metameric segmentation. Metameric segmentation is a longitudinal division of the body into a similar section of parts.
Arthropoda- It includes all the animals with jointed legs.
Mollusca- They are soft-bodied animals with bilateral symmetry.
Echinodermata- These are spiny-skinned marine animals.
Question:40
A coelomate has a body cavity between the body wall and the digestive tract.
Pseudocoelomate has a fluid-filled body cavity between the endoderm and the mesoderm.
Acoelomates do not have a body cavity or a coelom.
Spongilla- acoelomate
Sea anemone- acoelomate
Planaria- acoelomate
Liver fluke- acoelomate
Wuchereria-pseudocoelomate
Ascaris-pseudocoelomate
Nereis- coelomate
Earthworm- coelomate
Scorpion- coelomate
Birds- coelomate
Fishes- coelomate
Horse- coelomate
Question:41
The skeleton of bony fish is made of bones while as cartilaginous fish is made of only cartilage.
Cartilaginous- Torpedo, Stingray, Dogfish
Bony- Rohu, Angler fish, Exocoetus
Question:42
Rohu- 2 chambered
Scoliodon-2 chambered
Frog-3 chambered
Salamander-3 chambered
Flying lizard-3 chambered
King Cobra-3 chambered
Crocodile-4 chambered
Ostrich-4chambered
Bat-4chambered
Whale-4 chambered
Question:43
Cold-blooded animals cannot control their body temperature and therefore become sluggish in cold weather while as warm-blooded animals maintain their constant body temperature. The classification of animals as warm and cold blooded are as under-
Cold blooded animals- Rohu, Scolidon, Flying lizard, King Cobra, Frog, Salamander, Crocodile
Warm Blooded animals- Ostrich, Pigeon, Bat, Whale
Question:44
Name two egg laying mammals.
Answer:
Egg laying animals are called as viviparous. Billed platypus and the echidna are the egg-laying mammals, called as monotremes.
Question:45
(a) Five kingdom classification of living organisms is given by Robert Whittaker.
(b) Basic smallest unit of classification is Species.
(c) Prokaryotes are grouped in Kingdom Monera.
(d) Paramecium is a protista because of its Eukaryotic unicellular morphology.
(e) Fungi do not contain Chlorophyll.
(f) A fungus Mushroom can be seen without microscope.
(g) Common fungi used in preparing the bread is Yeast.
(h) Algae and fungi form symbiotic association called Lichens.
Question:46
(a) True- Gymnosperms are the plants which are characterized by the naked seeds. While in angiosperm plant, the embryo is covered in a hard coating called as a seed.
(b) True- A cryptogam is a plant that reproduces by spores, without flowers or seeds.
(c) False- Bryophytes do not have conducting tissues. They are non-vascular terrestrial plants.
(d) True - Funaria is a moss and bears male and female sex organs at the apices of two different shots of the same plant.
(e) True- All ferns have pinnate leaves with one central axis and smaller branches called as frond.
(f) True- The embryo is the fertilised ovule with an immature plant from which a new plant will grow under proper conditions.
Question:47
(a) Bilateral, dorsiventral symmetry is found in Liver Fluke.
(b) Worms causing disease elephantiasis is Filarial worm.
(c) Open circulatory system is found in Arthropods where coelomic cavity is filled with blood.
(d) Nematodes are known to have pseudocoelom.
Question:48
Label a, b, c and d. given in Fig. 7.1 Give the function of (b)
Answer:
a.Dorsal fin- present along the mid-dorsal line.
b.Caudal fin- found at the tip of the tail.
c. Pelvic fin- present in pair, at the posterior position of the fish body.
d. Pectoral fin- present in pair, at the anterior position of the fish body.
Question:49
Fill in the boxes given in Fig. 7.2 with appropriate characteristics/plant group (s)
Answer:
Thallophyta- It includes primitive life forms of a plant which have simple plant body. E.g., Ulothrix, Spirogyra, Cladophara
Vascular tissue without specialization are present in thallophytes and bryophytes.
Pteridophyta- These vascular plants reproduce using spores.
Phanerogams- These are thet plants that have special structures for reproduction and produce seeds.
Bare naked seeds- These belong to gymnosperms. E.g. conifers.
Angiosperms-These are the vascular plants and have stem, roots and leaves.
Seeds with two cotyledons- These are called as dicotyledons e.g. beans.
Monocots- The seeds with one cotyledon e.g. rice, maize
Question:50
Write names of few thallophytes. Draw a labelled diagram of Spirogyra.
Answer:
Thallophyta belong to the plant kingdom. It includes primitive life forms of a plant which have simple plant body. E.g., Ulothrix, Spirogyra, Cladophara, Ulva and Chara are few of the examples for Thallophytes
Question:51
Thallophyta, bryophyta and pteridophyta belong to the sub kingdom called Cryptogamae. They are seedless and flowerless plants. Their reproductive organs are very inconspicuous, and are therefore called as ‘cryptogams’, or ‘those with hidden reproductive organs’. They reproduce with the help of spores.
Example: Pinus
Gymnosperms and angiosperms belong to sub-kingdom called phanerogamae. These are the flowering plants with well-differentiated reproductive parts that produces seeds.
Example: Cycas
Question:52
Define the terms and give one example of each
(a) Bilateral symmetry
(b) Coelom
(c) Triploblastic
Answer:
Bilteral symmetry- The organisms whose body shapes are mirror images of each other if cut along a middle line. They have indentical right and left halves in only one plane. E.g., Annelids.
Coelom- It is a body cavity filled with fluid with a complete lining derived from mesoderm. e.g. Chordates.
Triploblastic- The animals with 3 embryonic germ layers (mesoderm, ectoderm, endoderm) from which differentiated tissues are made are called triploblastic organisms. Ex: Star Fish.
Question:53
All of these organisms possess segmented body organisation but they do not belong to a single group of organisms. Leech and Nereis belong to phylum Annelida but Scolopendra, prawn and scorpion belong to phylum Arthropoda.
Annelids have a metamerically segmented body i.e., the body is divided into more or less similar types of segments and external segmentation corresponds to the internal segmentation i.e. body cavity is also segmented through septa. The locomotory organs present in them are suckers in case of leech and parapodia in case of Nereis. They possess a close blood vascular system and their excretory organs are nephridia.
Arthropods have jointed legs, open circulatory system, body is ocvered with chitin and tracheal system for respiration.
Question:54
Which organism is more complex and evolved among Bacteria, Mushroom and Mango tree. Give reasons.
Answer:
Bacteria is a unicellular organism while as mushroom and mango tree are multicellular.
But Mango tree is more complex and evolved organism amongst all because it is eukaryotic, multicellular, autotrophic plant found on the land. It belongs to the class angiosperm and its seeds are present within the fruit. It produces flowers and the reproductive organs are present in it.
While as bacteria is a prokaryotic unicellular organism and mushrooms belong to the class fungi and are heterotrophic thallophytes without any differentiation of stem leaves and roots, vascular tissues and embryonic stage is absent.
Question:55
Differentiate between flying lizard and bird. Draw the diagram.
Answer:
Flying lizard |
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Question:56
List out some common features in cat, rat and bat.
Answer:
Cat, rat and bat belong to the class Mammalia. The common characteristic features between them are as under-
All of them are multicellular and have nucleus present in their cells.
Their mode of nutrition is heterotrophic in nature.
All have notochord present in them.
The presence of four-chambered heart in them.
They have a dorsal nerve cord.
All are triploblastic in nature.
They are coelomate.
They are viviparous i.e. give birth to the offsprings and have mammary glands present to feed their offsprings.
Question:57
Why do we keep both snake and turtle in the same class?
Answer:
Snake and turtle both belong to the class- Reptilia. They have common characteristic features which are as under-
They are cold-blooded animals.
They have skin without glands.
They have scales present on their body.
They respire with the help of lungs.
They have a three-chambered heart
Both of them are oviparous i.e., eggs laying animals.
They have hard shelled eggs and they need not to lay them in water
NCERT exemplar Class 9 Science solutions chapter 7 on Diversity in Living Organisms cover the following key points of the chapter:
Chapter wise solutions |
These Class 9 Science NCERT exemplar chapter 7 solutions provide a basic understanding of diversity at different levels. The differences between structures of organs and systems cause diversity in living beings. CBSE Class 9 students can understand and refer to these detailed solutions to equip them with a sound understanding of the concepts of Diversity in Living Organisms. The NCERT exemplar Class 9 Science chapter 7 solutions are sufficient to attempt other books such as NCERT Class 9 Science TextBook, Biology Question Bank et cetera.
A unique feature: NCERT exemplar Class 9 Science solutions chapter 7 pdf download offers the students the attribute to view/download these solutions of NCERT exemplar Class 9 Science chapter 7 and refer to them in offline circumstances.
Chapter No. | Chapter Name |
Chapter 1 | Matter in Our Surroundings |
Chapter 2 | Is Matter Around Us Pure |
Chapter 3 | Atoms and Molecules |
Chapter 4 | Structure of The Atom |
Chapter 5 | The Fundamental Unit of Life |
Chapter 6 | Tissues |
Chapter 7 | Diversity in Living Organisms |
Chapter 8 | Motion |
Chapter 9 | Force and Laws of Motion |
Chapter 10 | Gravitation |
Chapter 11 | Work and Energy |
Chapter 12 | Sound |
Chapter 13 | Why Do We Fall ill? |
Chapter 14 | Natural Resources |
Chapter 15 | Improvement in Food Resources |
A1. Biodiversity is commonly measured by the number of different organisms on earth.
A2. He categorized all living organisms into five kingdoms. These kingdoms are:
Monera
Protista
Fungi
Plantae
Animalia
A3. Generally, 3-4 questions appear from these Class 9 Science NCERT exemplar chapter 7 solutions in the final examination distributed across objective, short, and long answer type questions. NCERT exemplar Class 9 Science solutions chapter 7 due to its comprehensive nature of solutions is adequate to score well in the chapter on Diversity in Living Organisms.
Database professionals use software to store and organise data such as financial information, and customer shipping records. Individuals who opt for a career as data administrators ensure that data is available for users and secured from unauthorised sales. DB administrators may work in various types of industries. It may involve computer systems design, service firms, insurance companies, banks and hospitals.
The field of biomedical engineering opens up a universe of expert chances. An Individual in the biomedical engineering career path work in the field of engineering as well as medicine, in order to find out solutions to common problems of the two fields. The biomedical engineering job opportunities are to collaborate with doctors and researchers to develop medical systems, equipment, or devices that can solve clinical problems. Here we will be discussing jobs after biomedical engineering, how to get a job in biomedical engineering, biomedical engineering scope, and salary.
A career as ethical hacker involves various challenges and provides lucrative opportunities in the digital era where every giant business and startup owns its cyberspace on the world wide web. Individuals in the ethical hacker career path try to find the vulnerabilities in the cyber system to get its authority. If he or she succeeds in it then he or she gets its illegal authority. Individuals in the ethical hacker career path then steal information or delete the file that could affect the business, functioning, or services of the organization.
GIS officer work on various GIS software to conduct a study and gather spatial and non-spatial information. GIS experts update the GIS data and maintain it. The databases include aerial or satellite imagery, latitudinal and longitudinal coordinates, and manually digitized images of maps. In a career as GIS expert, one is responsible for creating online and mobile maps.
The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.
Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.
Individuals who opt for a career as geothermal engineers are the professionals involved in the processing of geothermal energy. The responsibilities of geothermal engineers may vary depending on the workplace location. Those who work in fields design facilities to process and distribute geothermal energy. They oversee the functioning of machinery used in the field.
If you are intrigued by the programming world and are interested in developing communications networks then a career as database architect may be a good option for you. Data architect roles and responsibilities include building design models for data communication networks. Wide Area Networks (WANs), local area networks (LANs), and intranets are included in the database networks. It is expected that database architects will have in-depth knowledge of a company's business to develop a network to fulfil the requirements of the organisation. Stay tuned as we look at the larger picture and give you more information on what is db architecture, why you should pursue database architecture, what to expect from such a degree and what your job opportunities will be after graduation. Here, we will be discussing how to become a data architect. Students can visit NIT Trichy, IIT Kharagpur, JMI New Delhi.
Individuals who opt for a career as a remote sensing technician possess unique personalities. Remote sensing analysts seem to be rational human beings, they are strong, independent, persistent, sincere, realistic and resourceful. Some of them are analytical as well, which means they are intelligent, introspective and inquisitive.
Remote sensing scientists use remote sensing technology to support scientists in fields such as community planning, flight planning or the management of natural resources. Analysing data collected from aircraft, satellites or ground-based platforms using statistical analysis software, image analysis software or Geographic Information Systems (GIS) is a significant part of their work. Do you want to learn how to become remote sensing technician? There's no need to be concerned; we've devised a simple remote sensing technician career path for you. Scroll through the pages and read.
Budget analysis, in a nutshell, entails thoroughly analyzing the details of a financial budget. The budget analysis aims to better understand and manage revenue. Budget analysts assist in the achievement of financial targets, the preservation of profitability, and the pursuit of long-term growth for a business. Budget analysts generally have a bachelor's degree in accounting, finance, economics, or a closely related field. Knowledge of Financial Management is of prime importance in this career.
The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.
Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.
An underwriter is a person who assesses and evaluates the risk of insurance in his or her field like mortgage, loan, health policy, investment, and so on and so forth. The underwriter career path does involve risks as analysing the risks means finding out if there is a way for the insurance underwriter jobs to recover the money from its clients. If the risk turns out to be too much for the company then in the future it is an underwriter who will be held accountable for it. Therefore, one must carry out his or her job with a lot of attention and diligence.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the operations manager jobs are responsible for ensuring the efficiency of each department to acquire its optimal goal. They plan the use of resources and distribution of materials. The operations manager's job description includes managing budgets, negotiating contracts, and performing administrative tasks.
Individuals who opt for a career as a stock analyst examine the company's investments makes decisions and keep track of financial securities. The nature of such investments will differ from one business to the next. Individuals in the stock analyst career use data mining to forecast a company's profits and revenues, advise clients on whether to buy or sell, participate in seminars, and discussing financial matters with executives and evaluate annual reports.
A Researcher is a professional who is responsible for collecting data and information by reviewing the literature and conducting experiments and surveys. He or she uses various methodological processes to provide accurate data and information that is utilised by academicians and other industry professionals. Here, we will discuss what is a researcher, the researcher's salary, types of researchers.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A career as Transportation Planner requires technical application of science and technology in engineering, particularly the concepts, equipment and technologies involved in the production of products and services. In fields like land use, infrastructure review, ecological standards and street design, he or she considers issues of health, environment and performance. A Transportation Planner assigns resources for implementing and designing programmes. He or she is responsible for assessing needs, preparing plans and forecasts and compliance with regulations.
Individuals who opt for a career as an environmental engineer are construction professionals who utilise the skills and knowledge of biology, soil science, chemistry and the concept of engineering to design and develop projects that serve as solutions to various environmental problems.
A Safety Manager is a professional responsible for employee’s safety at work. He or she plans, implements and oversees the company’s employee safety. A Safety Manager ensures compliance and adherence to Occupational Health and Safety (OHS) guidelines.
A Conservation Architect is a professional responsible for conserving and restoring buildings or monuments having a historic value. He or she applies techniques to document and stabilise the object’s state without any further damage. A Conservation Architect restores the monuments and heritage buildings to bring them back to their original state.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
Highway Engineer Job Description: A Highway Engineer is a civil engineer who specialises in planning and building thousands of miles of roads that support connectivity and allow transportation across the country. He or she ensures that traffic management schemes are effectively planned concerning economic sustainability and successful implementation.
Are you searching for a Field Surveyor Job Description? A Field Surveyor is a professional responsible for conducting field surveys for various places or geographical conditions. He or she collects the required data and information as per the instructions given by senior officials.
Orthotists and Prosthetists are professionals who provide aid to patients with disabilities. They fix them to artificial limbs (prosthetics) and help them to regain stability. There are times when people lose their limbs in an accident. In some other occasions, they are born without a limb or orthopaedic impairment. Orthotists and prosthetists play a crucial role in their lives with fixing them to assistive devices and provide mobility.
A career in pathology in India is filled with several responsibilities as it is a medical branch and affects human lives. The demand for pathologists has been increasing over the past few years as people are getting more aware of different diseases. Not only that, but an increase in population and lifestyle changes have also contributed to the increase in a pathologist’s demand. The pathology careers provide an extremely huge number of opportunities and if you want to be a part of the medical field you can consider being a pathologist. If you want to know more about a career in pathology in India then continue reading this article.
Gynaecology can be defined as the study of the female body. The job outlook for gynaecology is excellent since there is evergreen demand for one because of their responsibility of dealing with not only women’s health but also fertility and pregnancy issues. Although most women prefer to have a women obstetrician gynaecologist as their doctor, men also explore a career as a gynaecologist and there are ample amounts of male doctors in the field who are gynaecologists and aid women during delivery and childbirth.
The audiologist career involves audiology professionals who are responsible to treat hearing loss and proactively preventing the relevant damage. Individuals who opt for a career as an audiologist use various testing strategies with the aim to determine if someone has a normal sensitivity to sounds or not. After the identification of hearing loss, a hearing doctor is required to determine which sections of the hearing are affected, to what extent they are affected, and where the wound causing the hearing loss is found. As soon as the hearing loss is identified, the patients are provided with recommendations for interventions and rehabilitation such as hearing aids, cochlear implants, and appropriate medical referrals. While audiology is a branch of science that studies and researches hearing, balance, and related disorders.
An oncologist is a specialised doctor responsible for providing medical care to patients diagnosed with cancer. He or she uses several therapies to control the cancer and its effect on the human body such as chemotherapy, immunotherapy, radiation therapy and biopsy. An oncologist designs a treatment plan based on a pathology report after diagnosing the type of cancer and where it is spreading inside the body.
Are you searching for an ‘Anatomist job description’? An Anatomist is a research professional who applies the laws of biological science to determine the ability of bodies of various living organisms including animals and humans to regenerate the damaged or destroyed organs. If you want to know what does an anatomist do, then read the entire article, where we will answer all your questions.
For an individual who opts for a career as an actor, the primary responsibility is to completely speak to the character he or she is playing and to persuade the crowd that the character is genuine by connecting with them and bringing them into the story. This applies to significant roles and littler parts, as all roles join to make an effective creation. Here in this article, we will discuss how to become an actor in India, actor exams, actor salary in India, and actor jobs.
Individuals who opt for a career as acrobats create and direct original routines for themselves, in addition to developing interpretations of existing routines. The work of circus acrobats can be seen in a variety of performance settings, including circus, reality shows, sports events like the Olympics, movies and commercials. Individuals who opt for a career as acrobats must be prepared to face rejections and intermittent periods of work. The creativity of acrobats may extend to other aspects of the performance. For example, acrobats in the circus may work with gym trainers, celebrities or collaborate with other professionals to enhance such performance elements as costume and or maybe at the teaching end of the career.
Career as a video game designer is filled with excitement as well as responsibilities. A video game designer is someone who is involved in the process of creating a game from day one. He or she is responsible for fulfilling duties like designing the character of the game, the several levels involved, plot, art and similar other elements. Individuals who opt for a career as a video game designer may also write the codes for the game using different programming languages.
Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.
Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.
The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.
A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.
An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.
They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.
A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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