NCERT Exemplar Class 11 Biology Solutions Chapter 4 Animal Kingdom 2021

NCERT Exemplar Class 11 Biology Solutions Chapter 4 Animal Kingdom

Edited By Priyanka kumari | Updated on Aug 22, 2022 04:25 PM IST

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NCERT Exemplar Class 11 Biology Solution of Chapter 4 Animal Kingdom:
Multiple Choice Questions:
Short Answer Type Questions:
Short Answer Type Questions:
Long Answer Type Questions:
Introduction of NCERT Exemplar Class 11 Biology Solutions Chapter 4:
Major Subtopics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:
NCERT Exemplar Class 11 Biology Solutions Chapter 4 - Learning Outcome:
NCERT Exemplar Class 11 Biology Solutions Chapter Wise:
Important Topics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:

Also, check NCERT Class 11 Biology Solutions of other chapters.

NCERT Exemplar Class 11 Biology Solution of Chapter 4 Animal Kingdom:

Multiple Choice Questions:

Question:1

In some animal groups, the body is found divided into compartments with a serial repetition of at least some organs. This characteristic feature is called
a. Segmentation
b. Metamerism
c. Metagenesis
d. Metamorphosis

Answer:

The answer is Option (b) Metamerism

Explanation: -
The body in some animal is externally as well as internally separated into fragments with a serial repetition of at least some organs. This is called Metamerism. In other words, Metamerism is the condition of being constructed of a linear series of repeating
parts. For example, in the earthworm, the body shows Metamerism.If we talk about Metagenesis, it is the reproduction cycle of an organism alternating between sexual and asexual mode. The Metamorphosis is the process through which animals such as amphibians, insects, and a few aquatic animals, experience extreme physical changes after birth.

Question:2

Given below are types of cells present in some animals. Which of the following cells can differentiate to perform different functions?
a. Choanocytes
b. Interstitial cells
c. Gastrodermal cells
d. Nematocytes

Answer:

The answer is option (b), Interstitial Cells.

Explanation: -
Interstitial cells in ovary and testes can differentiate. By Interstitial cell, it refers to any cell that lies in the places amid the functional cells of a tissue.
Examples include:
- Cells present in the male testes that are responsible for the production of androgen (male sex hormone) portion of the stroma.
- Interstitial cell of Cajal (ICC) Leydig cells.

Question:3

Which one of the following sets of animals shares a four-chambered heart?
a. Amphibian, Reptiles, Birds
b. Crocodiles, Birds, Mammals
c. Crocodiles, Lizards, Turtles
d. Lizards, Mammals, Birds

Answer:

The answer is Option (b), Crocodiles, Birds, Mammals.
Explanation:
The heart is generally three-chambered in reptiles with the exception of crocodiles,which possess a four-chambered heart. The division in their heart is due to the incomplete interventricular septum, in ventricles. If we talk about heart in birds and
mammals, it is four-chambered, and there is a complete division of interventricular septum in ventricles. Whereas, amphibians hold a three-chambered heart in which the ventrid are not alienated; hence, two atria and one ventricle are present.

Question:4

Which of the following pairs of animals has non-glandular skin?
a. Snake and Frog
b. Chameleon and Turtle
c. Frog and Pigeon
d. Crocodile and Tiger

Answer:

The answer is an option (b), Chameleon and Turtle.

Explanation:
Chameleon and turtle belonging to Reptilia class. They possess dry and non-glandular skin with scales. Frog, pigeon, and tiger own modifications in their skin according to adaptations in their particular habitats.

Question:5

Birds and mammals share one of the following characteristics as a common feature.
a. Pigmented skin
b. Pneumatic bones
c. Viviparity
d. Warm-blooded

Answer:

The answer is the option (d), Warm-blooded

Explanation:
A distinguishing feature of warm-blooded animals is that they can maintain constant body temperature, irrespective of the surrounding environment. In other words, their body temperature is fixed. This is the common characteristic feature in birds and
mammals. Higher reptiles are the first to evolve this characteristic. Later the birds and mammals acquire this feature from higher reptiles during evolution. Concerning, pigmented skin is an adaptive feature in mammals, and which are not present in birds. Pneumatic bones are found only in birds as their flight version.These reduce bodyweight for flight.

Viviparity is shown by mammals and not by birds as they are oviparous, i.e. lay eggs.

Question:6

Which one of the following sets of animals belongs to a single taxonomic group?
a. Cuttlefish, Jellyfish, Silverfish, Dogfish, Starfish
b. Bat, Pigeon, Butterfly
c. Monkey, Chimpanzee, Man
d. Silkworm, Tapeworm, Earthworm

Answer:

The answer is the option (c), Monkey, Chimpanzee, Man.

Explanation:
Monkey, chimpanzee, and man belong to a single taxonomic group. That is mammals because all of them possess the following features.
(i) Milk producing mammary glands.
(ii) Two pairs of limbs.
(iii) Presence of external ears.
(iv) Viviparity.
(v) Skin possessing hair.
Whereas the other options belong to other groups given as below:

Animal Group	Taxonomic Group
Cuttlefish Jellyfish Silverfish Dogfish Starfish	Phylum-Mollusca, Class-Cephalopoda, Phylum-Cnidaria Class-Insecta, Order-Thysanura, Phylum-Arthropoda, Phylum-Chordata, Class-Chondrichthyes, Phylum-Echinodermata, Class-Asteroidea.

Animal Group	Taxonomic Group
Bat Pigeon Butterfly	Phylum-Chordata, Class-Mammalia Phylum-Chordata, Class Aves Phylum-Arthropoda,Class-Insecta, Order-Lepidoptera

Animal Group	Taxonomic Group
Silkworm Tapeworm Earthworm	Phylum-Arthropoda, Class-Insecta, Order- Lepidoptera Phylum-Platyhelminthes, Class-Cestoda Phylum-Annelida, Class-01igochaeta

Question:7

Which one of the following statements is incorrect?
a. Mesoglea is present in between ectoderm and endoderm in Obelia.
b. Exhibits radial symmetry Asterias
c. Fasciola is a pseudocoelomate animal
d. Taenia is a triploblastic animal

Answer:

The answer is the option (c), Fasciola is a pseudocoelomate animal.
Explanation:
Fasciola is an acoelomate animal. Fasciola is not a pseudocoelomate animal as it does not possess a body cavity, and hence, it is an acoelomate.
Mesoglea is an undifferentiated layer and is a characteristic of diploblastic and triploblastic animals present along with ectoderm and endoderm.
Asterias shows a type of symmetry called radial symmetry. A Symmetry in which the body can be divided into two equal, identical halves from any plane passing through
the central axis.
Taenia is a triploblastic animal as it possesses three germinal layers, i.e., ectoderm,endoderm, and mesoderm.

Question:8

Which one of the following statements is incorrect?
a. In cockroaches and prawns excretion of waste material occurs through malpighian tubules.
b. In ctenophores, locomotion is mediated by comb plates.
c. In Fasciola, flame cells help in excretion
d. Earthworms are hermaphrodites, and yet cross-fertilisation takes place among them.

Answer:

The answer is the option (a), in cockroaches and prawns excretion of waste material
occurs through malpighian tubules.
Explanation:
The expression, “In cockroaches and prawns excretion of waste material occurs through malpighian tubules” is incorrect because Malpighian tubules are excretory structures in most of the insects, including cockroach, but green glands perform excretory functions in crustaceans like prawns. Rest all other statements are true.

Question:9

Which one of the following is oviparous?
a. Platypus
b. Flying fox (Bat)
c. Elephant
d. Whale

Answer:

The answer is the option (a), platypus.
Explanation:
Platypus is a primitive mammal which shows many characters of their reptilian descent, such as ovaparity. This means that these lay eggs. Rest all three animals,i.e., flying fox, elephant and whale are viviparous mammals and giving birth to young ones.

Question:10

Which one of the following is a non-poisonous snake?
a. Platypus
b. Flying fox (Bat)
c. Elephant
d. Whale

Answer:

The answer is the option (c).

Question:11

Match the following list of animals with their level of organisation.

Division of Labour	Animal
Column-1	Column-2
A. Orange level	i) Pheretima
B. Cellular aggregatelevel	ii) Fasciola
C. Tissue Level	iii) Spongilla
D. Organ System Level	iv) Obelia

Choose the correct match showing the division of labour with animal example.
a. i-B, ii-C, iii-D, and iv-A
b. i-B, ii-D, iii-C, and iv-A
c. i-D, ii-A, iii-B, and iv-C
d. i-A, ii-D, iii-C, and iv-B

Answer:

The answer is the option (c),
i-D, ii-A, iii-B, and iv-C

Question:12

The body cavity is the cavity present between the body wall and the gut wall. In some animals, the body cavity is not lined by mesoderm.

Such animals are called
a. Acoelomates
b. Pseudocoelomates
c. Coelomates
d. Haemocoelomates

Answer:

The answer is the option (b), Pseudocoelomates.

Question:13

Match the column A with column B and choose the correct option

Column I

A. Porifera

B. Aschelminthes

C. Annelida

D. Arthropoda

E. Echinodermata

Column II

i. Canal system

ii. Water-vascular system

iii. Muscular pharynx

iv. Jointed appendages

v. Metameres

a. A-ii, B-iii, C-v, D-iv, E-i
b. A-ii, B-v, C-iii, D-iv, E-i
c. A-i, B-iii, C-v, D-iv, E-ii
d. A-i, B-v, C-iii, D-iv, E-ii

Answer:

The answer is option (c),
A-i, B-iii, C-v, D-iv, E-ii

Short Answer Type Questions:

Question:1

Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.

Answer:

The phylum in which the radial symmetry is exhibited by the adult while the bilateral symmetry is exhibited by the larva is in the case of the phylum Echinodermata.

Question:2

What is the importance of pneumatic bones and air sacs in Aves?

Answer:

Importance of Pneumatic bones lies in making the body lightweight and facilitate the flying. Air sacs are helpful in respiration and buoyancy.

Question:3

What is Metagenesis? Mention an example which exhibits this phenomenon.

Answer:

Metagenesis is a phenomenon defined for the reproduction cycle of an organism alternating between sexual and asexual mode.

Question:4

What is the role of feathers?

Answer:

Feathers are meant for flying by reducing the overall weight of the body. They create an airfoil shape of wings and help in flying. For example-In Aves, besides pneumatic bones, feathers are also helpful in making the body weigh lighter and help in flight.
Feathers are also helpful in mating.

Question:5

Which group of chordates possess sucking and circular mouth without jaws?

Answer:

Cyclostomes have sucking and circular mouth that is without jaws. They are also referred to as jawless fish. Since the shape of their mouth is circular and they lack the jaws, they are also called agnathans.

Question:6

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Answer:

Placoid scales are defined as the tiny tough scales that cover entire skin.
Examples are Trygon, Pritis.
Cycloid scales are exemplified by having a smooth outer margin. Examples are Catla, Clarias

Question:7

Mention two modifications in reptiles required for terrestrial mode of life.

Answer:

The two modification in reptiles required for terrestrial mode of life is as below:
1. Internal fertilisation which is required to makes the chances of the survival of young ones better.
2. The body to be covered with dry and cornified skin and epidermal scales.

Question:8

Mention one example each for animals with a chitinous exoskeleton and those covered by a calcareous shell.

Answer:

Cockroach (Arthropods) have the body covered with Chitinous exoskeleton, and Pila (Molluscs) have the body covered with a calcareous shell.

Question:9

What is the role of the radula in molluscs?

Answer:

The radula in molluscs is a special structure which is used to scrape and scratch the food. This is also used to produce a depression the in rocks which is used by molluscs as their habitat.

Question:10

Name the animal, which exhibits the phenomenon of bioluminescence.Mention the phylum to which it belongs.

Answer:

Bioluminescence is a phenomenon that involves emission and production of light by any organism. This is a result of a chemical reaction under which the chemical energy is converted into light energy. Pleurobrachia and Ctenoplana are some animals exhibiting the phenomenon of bioluminescence.
They belong to phylum ctenophores like Ctenoplana, Velamen, Beroe, etc.

Question:11

Write one example each of the following in the space provided.
a. Cold blooded animal ________________________
b. Warm blooded animal ________________________
c. Animal possessing dry and cornified skin _______________
d. Dioecious animal _____________________

Answer:

Cold-blooded animal: Frog (Amphibians)
b. Warm-blooded animal: Humans (Mammals)
c. Animal possessing dry and cornified skin: Lizard (Reptiles)
d. Dioecious animal: Ascaris (Aschelminthes)

Question:12

Differentiate between a diploblastic and a triploblastic animal.

Answer:

Diploblastic animals are the one with cells arranged in two embryonic layers.
For Example Coelenterates
Whereas the triploblastic animals are those in which the developing embryo has a third germinal layer.
For Example, Chordates.

Question:13

Give an example of the following
a. Roundworm
b. Fish possessing poison sting
c. A limbless reptile/ amphibian
d. An oviparous mammal

Answer:

a. Roundworm: Ascaris
b. Fish possessing poison sting: Trygon
c. A limbless reptile/ amphibian: reptile – Snake, Amphibian – Ichthyophis
d. An oviparous mammal: Duck-billed platypus

Question:14

Provide appropriate technical term in the space provided.
a. Blood-filled cavity in arthropods __________________________.
b. Free-floating form of cnidaria _____________________________.
c. Stinging organ of jelly fishes ______________________________.
d. Lateral appendages in aquatic annelids ___________________.

Answer:

a. A blood-filled cavity in arthropods: Haemocoel
b. Free-floating form of cnidaria: Medusa
c. The stinging organ of jellyfishes: Nematocyst
d. Lateral appendages in aquatic annelids: Parapodia

Question:15

Match the following:

Animals Locomotory

a. Octopus

b. Crocodile

c. Catla iii.

d. Ctenoplana

Organ

i. Limbs

ii. Comb plates

iii. Tentacles

iv. Fins

Answer:

a. Octopus – Tentacles
b. Crocodile – Limbs
c. Catla – Fins
d. Ctenoplana – Comb plates

Short Answer Type Questions:

Question:1

Differentiate between:
a. Open circulatory system and closed circulatory system
b. Oviparous and viviparous characteristic
c. Direct development and Indirect development

Answer:

a) In the open circulatory system, blood is pumped out the heart, and the cells and tissues are directly bathed whereas in the closed circulatory system blood is circulated throughout the body with the help of series of vessels. Examples of the open circulatory
system are Arthropods and Mollucus. Examples of the closed circulatory system are Annelids and Vertebrates.

b) Oviparous refers to the Laying fertilised and unfertilised eggs, whereas viviparous refers to giving birth to young ones. Reptiles, birds, and some mammals fall into oviparous whereas Scolidon and most mammals fall into the category of viviparous.

c) Direct development refers to a form when a larval stage is absent in the development of the organism. In simple words, when the young ones resemble the adult, it is direct development, for example, mammals, reptiles, etc.
Indirect development refers to when the larval stage is present in the development of the organism which does not resemble the adult. In other words, when the young ones are different from the adults, this is indirect development, for example, frog, cockroach, silkworm.

Question:2

Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.

Answer:

In the case of radial symmetry, an individual’s body can be divided into equal halves by any plans passing through the longitudinal axis.
Examples of Radial symmetry are Coelenterates, Ctenophores, Echinoderms.

In the case of bilateral symmetry, the body can be divided into two halves when the plane passes through the median longitudinal axis.
Examples of Bilateral symmetry are Annelids, Arthropods.

Question:3

There has been an increase in the number of chambers in the heart during the evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.

Answer:

Two-chambered hearts: Chrondrichytes and osteocytes
Three-chambered heart: Amphibia and Reptile
Four-chambered heart: Aves and mammalian

Question:4

Fill up the blank spaces appropriately

Phylum/Class	Excretory organ	Circulatory organ	Respiratory organ
Arthropoda	A	B	Lungs/Gills/Tracheal system
C	Nephridia	Closed	Skin/parapodia
D	Metanephridia	Open	E
Amphibia	F	Closed	Lung

Answer:

The answer for A = Malpighian tubules
The answer for B = Open
The answer for C = Annelida
The answer for D = Mollusca
The answer for E = Feather-like gills
The answer for F = Amphibians have kidneys as their excretory organs

Question:5

Match the following

a. Amphibia

b. Mammals

c. Chondrichthyes

d. Osteichthyes

e. Cyclostomata

f. Aves

i. Air bladder

ii. Cartilaginous notochord

iii. Mammary glands

iv. Pneumatic bones

v. Dual habitat

vi. Sucking and circular mouth without jaws.

Answer:

a. Amphibia – Dual habitat
b. Mammals – Mammary glands
c. Chondrichthyes – Cartilaginous notochord
d. Osteichthyes – Air bladder
e. Cyclostomata – Sucking and circular mouth without jaws
f. Aves – Pneumatic bones

Question:6

Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.

Answer:

For the survival of Endoparasites inside a host body, they need to adapt to the following mentioned condition:
1. Presence of adhesive organs for clinging on to the host.
2. High reproductive capacity
3. Loss of unnecessary sense organs.
4. They sometimes travel to another host so should have good adaption feature.
5. Loss of digestive system.

Question:7

Match the following and write correct choice in space provideda.

Animal

a. Pila

b. Cockroach

c. Asterias

d. Torpedo

e. Parrot

f. Dogfish

Characteristics of

i. Jointed appendages

ii. Perching

iii. Water vascular system

iv. Electric organ

v. Presence of shell

vi. Placoid scales

a._____, b. ______, c. _____, d. ___, e. _____, f. ____,

Answer:

a. Pila – Presence of shell
b. Cockroach – Jointed appendages
c. Asterias – Water vascular system
d. Torpedo – Electric organ
e. Parrot – Perching
f. Dogfish – Placoid scales

Animal a. Pila b. Cockroach c. Asterias d. Torpedo e. Parrot f. Dogfish Characteristics of i. Jointed appendages ii. Perching iii. Water vascular system iv. Electric organ v. Presence of shell vi. Placoid scales a._____, b. ______, c. _____, d. ___, e. _____, f. ____,

Question:8

Differentiate between:
a. Open and closed circulatory system
b. Oviparity and viviparity
c. Direct and indirect development
d. Acoelomate and pseudocoelomate
e. Notochord and nerve cord
f. Polyp and medusa

Answer:

a) In the open circulatory system, blood is pumped out the heart, and the cells and tissues are directly bathed whereas, in the closed circulatory system, the blood
circulates throughout the body with assistance of a series of vessels.

b) Oviparous refers to Laying of fertilised and unfertilised eggs whereas viviparous refer to giving birth to young ones. Reptiles, birds, and some mammals fall into oviparous
whereas Scolidon and most mammals fall into the category of viviparous.

c) Direct development refers to a form when a larval stage is absent in the development of the organism. In simple words, when the young ones resemble the adult, it is direct
development. For example- mammals, reptiles, etc.
Indirect development refers to when the larval stage is present in the development of the organism which does not resemble the adult. In other words, when the young ones
are different than the adults, this is indirect development. For example- frog, cockroach, silkworm.

d) Coelomates are the animal possessing no coelom whereas Pseudocoelomates are the animals with the body cavity, which is lined by mesoderm rather than mesoderm, is
present in between ectoderm and endoderm.

e) The nerve cord is a strand comprising of solid nervous tissue while the notochord is a rod-like structure which is mesodermally derived and is formed on the dorsal side during embryonic development.

f) Polyp is a cylindrical and sessile form like Hydra while the Medusa is an free-swimming umbrella-shaped like jellyfish.

Question:9

Give the characteristic features of the following citing one example of each
a. Chondrichthyes and Osteichthyes
b. Urochordata and cephalochordate

Answer:

a) Chondrichthyes have mainly marine habitat, and their body is streamlined. They have a cartilaginous endoskeleton. Examples are scoliosis and Trygon.
Osteichthyes have a streamlined body and they have both marine as well as freshwater habitat with a bony endoskeleton. Some of the examples are Freshwater: Labeo (Rohu), Marine: Hippocampus (Sea horse), Aquarium: Betta (Fighting fish).

b) In case of cephalochordates, the notochord extends from head to tail region and stays persistent throughout the life cycle, whereas in the case of urochordates, the notochord is present only in the larval tail. Examples of Urochordates: Ascidia, Salpa Examples of Cephalochordates: Branchiostoma.

Question:10

Mention two similarities between
a. Aves and mammals
b. A frog and crocodile
c. A turtle and pila

Answer:

a) Aves and mammals are warm-blooded and have a four-chambered heart
b) Turtle and pilla are cold-blooded and are oviparous animals
c) A frog and crocodile are cold-blooded and are oviparous

Question:11

Name
a. A limbless animal
b. A cold-blooded animal
c. A warm-blooded animal
d. An animal possessing dry and cornified skin
e. An animal having a canal system and spicules
f. An animal with cnidoblasts

Answer:

a. An example of a limbless animal – Icthyophis
b. An example of a cold-blooded animal – Trygon
c. An example of a warm-blooded animal – Macaca (monkey)
d. An example of an animal possessing dry and cornified skin – Naja (Cobra)
e. An example of an animal having a canal system and spicules – Euspongia
f. An example of an animal with cnidoblasts – Hydra

Question:12

Give an example for each of the following
a. A viviparous animal
b. A fish possessing a poison sting
c. A fish possessing an electric organ
d. An organ, which regulates buoyancy
e. Animal, which exhibits alternation of generation
f. An oviparous animal with mammary gland

Answer:

a. An example of a viviparous animal – Panthera leo
b. An example of a fish possessing a poison sting – Trygon
c. An example of a fish possessing an electric organ – Torpedo
d. An example of an organ, which regulates buoyancy – Air bladder
e. An example of an animal, which exhibits alternation of generation – Obelia
f. An example of a an oviparous animal with mammary gland – Echidna

Question:13

Excretory organs of different animals are given below. Choose correctly and write in the space provided.

Animal Excretory Organ/Unit

a. Balanoglossus

b. Leech

c. Locust

d. Liver fluke

e. Sea urchin

f. Pila

Animal Excretory Organ/Unit

i. Metanephridia

ii. Nephridia

iii. Flame cells

iv. absent

v. malpighian tubule

vi. Probosci’s gland

a. ____________________, b. ____________________, c. _ d. ____________________, e. ____________________, f. ____________________

Answer:

a. Balanoglossus – Proboscis gland
b. Leech – Nephridia
c. Locust – Malpighian tubule
d. Liver fluke – Flame cells
e. Sea urchin – Absent
f. Pila – Metanephrida

Long Answer Type Questions:

Question:1

Give three major differences between chordates and non-chordates and draw a schematic sketch of a chordate showing those features.

Answer:

Chordates	Non-Chordates
They have a notochord Their tail is present at some stage in life Their heart is ventral Their CNS is dorsal Gill slits are present in the pharynx	They do not have a notochord Their tail is entirely absent Their heart is dorsal CNS is central, solid, and double Gill slits are absent

The sketch of a chordate showing features is below:

Question:2

What is the relationship between germinal layers and the formation of the body cavity in case of coelomate, acoelomates and pseudocoelomates?

Answer:

Germinal layers are those layers which formed during the process of gastrulation. It is widely described into three layers-
1.-The outer layer of germ is known as the ectoderm.
2.-The middle one is the endoderm
3. The innermost is the endoderm.
Coelomates are described as the organisms who are possessing coeloms, which is the body cavity lined by the mesoderm. Phylum Annelida, Mollusca, arthropods, etc. are examples of coelomates.

Acoelomates are the organisms with absent body cavities are. E.g. Platyhelminthes.Instead of have a lining by mesoderm, some organisms will have them in the form of a scattered pouch located in between the ectoderm and endoderm. This type of a body
cavity is known as pseudocolour, and animals possessing pseudocolour are often referred to as pseudocoelomates, e.g., Ascaris.

Question:3

Comment upon the habitats and external features of animals belonging to class, amphibia and reptilia.

Answer:

The external features and habitats of animals belonging to class, amphibia and reptilia are as follows: -
Amphibia
1. Amphibia are thin and have smooth skin which can live on both land and water.
2. Their have a pair of limbs.
3. Their eyes have eyelids.
4. A tympanum is representing the ears.
5. Examples are Rana(frog) and cobra
Reptilia
1. Reptiles are covered with dry and confined skin and scales.
2. They mostly live on land. Tympanum represents ear.
3. They have a pair of limbs. They will creep and crawl.
4. These category organisms are oviparous; fertilisation is internal, and development is direct or indirect.
5. Examples are crocodile, turtle etc.

Question:4

Mammals are most adapted among the vertebrates. Elaborate.

Answer:

Mammals have significantly adapted the most among the vertebrates. They can be found across a diverse range of habitats like deserts, plains, and mountains. They diverge in the type of jaws and sexes are separate, and fertilisation is internal. They
have a couple of limbs which are used for walking, burrowing, climbing etc. They have the mammary glands, which produces milk that is used to feed their young ones. They are warm-blooded which in turn helps them regulate their body temperature efficiently in
all types of weather conditions. They have hair-like arrangements that work as an insulation against cold temperatures. The heart present in mammals has four chambers and their brains are highly developed. Some examples of mammals are Whales, Humans, Dogs, Cows, etc
The significant features which make them most adaptive can be summarised as below:

They consume organic material for their survival.
They undertake sexual reproduction
Animals that are living together are engaged in complicated interactions with each other and thereby form the part of a ‘’food web.’’
In total, there are more than seven million different animal species.
Animals breathe oxygen in and then release out carbon dioxide.

Introduction of NCERT Exemplar Class 11 Biology Solutions Chapter 4:

NCERT exemplar solutions for Class 11 Biology chapter 4 is about Animal Kingdom. Chapter 4 is a very important part of your syllabus, and it deals with animals and their types. Animals are of many different types and animals here refer to the multicellular organisms. Millions of species have been discovered by scientists and many are still to be found. So, it becomes important to classify these species properly and give them a position in a category.

Major Subtopics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:

Following are the major subtopics in NCERT exemplar class 11 Biology chapter 4 solutions are

Basis of Classification
Levels of Organization
Symmetry
Diploblastic and Triploblastic Organization
Coelom
Segmentation
Notochord
Classification of Animals
Phylum– Porifera
Phylum- Coelenterata(Cnidaria)
Phylum- Ctenophora
Phylum- Platyhelminthes
Phylum- Aschelminthes
Phylum- Annelida
Phylum- Arthropoda
Phylum- Mollusca
Phylum- Echinodermata
Phylum- Hemichordata
Phylum- Chordata

NCERT Exemplar Class 11 Biology Solutions Chapter 4 - Learning Outcome:

In Class 11 Biology NCERT Exemplar solutions chapter 4 the students will learn more about the animals and their classification. The chapter is an interesting one but trying to remember it can be a little bit tricky. The students will find every topic in this NCERT Exemplar Class 11 Biology chapter 4 solutions in a fairly detailed manner and properly explained. Furthermore, the chapter will be of great importance for the students who are interested in zoology. So, the chapter is one of the important topics for the Class 11 Biology.

NCERT Exemplar Class 11 Biology Solutions Chapter Wise:

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Important Topics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:

· Levels of Organization – There are three levels of the organization, And these three levels are- cellular, tissue, and organ.

· Symmetry – The animals are categorized in this step (mostly on the bases of symmetry).

· Diploblastic and Triploblastic Organization – Animals having two embryonic layers are Diploblastic and organisms in which the developing embryo has a third germinal layer.

· Coelom – This involves the presence or absence of a cavity between the body wall and the gut wall.

· Segmentation – Segmentation is an external and internal division of the body into segments.

· Notochord – It refers to a mesodermally derived rod-like structure.

NCERT Exemplar Class 11 Solutions:

NCERT Exemplar Class 11 Mathematics Solutions

NCERT Exemplar Class 11 Chemistry Solutions

NCERT Exemplar Class 11 Physics Solutions

Check Chapter-Wise Solutions of Questions Given in Book:

Chapter 1	The Living World
Chapter 2	Biological Classification
Chapter 3	Plant Kingdom
Chapter 4	Animal Kingdom
Chapter 5	Morphology of Flowering Plants
Chapter 6	Anatomy of Flowering Plants
Chapter 7	Structural Organisation in Animals
Chapter 8	Cell: The Unit of Life
Chapter 9	Biomolecules
Chapter 10	Cell Cycle and Cell Division
Chapter 11	Transport in Plants
Chapter 12	Mineral Nutrition
Chapter 13	Photosynthesis in Higher Plants
Chapter 14	Respiration in Plants
Chapter 15	Plant Growth and Development
Chapter 16	Digestion and Absorption
Chapter 17	Breathing and Exchange of Gases
Chapter 18	Body Fluids and Circulation
Chapter 19	Excretory Products and Their Elimination
Chapter 20	Locomotion and Movement
Chapter 21	Neural Control and Coordination
Chapter 22	Chemical Coordination and Integration

Also, Read NCERT Solution subject wise

Must Read NCERT Notes subject wise

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Question (FAQs)

1. Will NCERT biology syllabus of class 11 is going to be reduced in 2020-2021?

Yes, the NCERT Biology syllabus for Class 11 2020-2021 is reduced.

2. From where can I download NCERT biology book for class 11 and 12?

You can download the book directly from the NCERT website.

3. Name some animals that are found parasitic on human beings from the Chapter 4 of NCERT Exemplar Solutions for Class 11 Biology.

Some animals that are found parasitic on human beings from the Chapter 4 of NCERT Exemplar Solutions for Class 11 Biology are –

1. Ascaris (Roundworm)

2. Taenia (Tapeworm)

3. Enterobius (Pinworm)

4. Ancylostoma (Hookworm)

5. Wuchereria (Filarial worm)

4. Is the NCERT Exemplar Class 11 Biology Chapter 4 solutions free of cost?

Yes, the NCERT Exemplar Solutions for Class 11 Biology Chapter 4 are completely free of cost.

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NCERT Exemplar Class 11 Maths Solutions Chapter 7 Permutations and Combinations

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Option 1) $0.34\; J$	Option 2) $0.16\; J$
Option 3) $1.00\; J$	Option 4) $0.67\; J$

Option 1) $2,000 \; J - 5,000\; J$	Option 2) $200 \, \, J - 500 \, \, J$
Option 3) $2\times 10^{5}J-3\times 10^{5}J$	Option 4) $20,000 \, \, J - 50,000 \, \, J$

Option 1) $K/2\,$	Option 2) $\; K\;$
Option 3) $zero\;$	Option 4) $K/4$

Option 1) $11.2\, L\, H_{2(g)}$ at STP is produced for every mole $HCL_{(aq)}$ consumed	Option 2) $6L\, HCl_{(aq)}$ is consumed for ever $3L\, H_{2(g)}$ produced
Option 3) $33.6 L\, H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts	Option 4) $67.2\, L\, H_{2(g)}$ at STP is produced for every mole Al that reacts .

Option 1) 0.02	Option 2) 3.125 × 10^-2
Option 3) 1.25 × 10^-2	Option 4) 2.5 × 10^-2

Option 1) decrease twice	Option 2) increase two fold
Option 3) remain unchanged	Option 4) be a function of the molecular mass of the substance.

Option 1) Molality	Option 2) Weight fraction of solute
Option 3) Fraction of solute present in water	Option 4) Mole fraction.

Option 1) twice that in 60 g carbon	Option 2) 6.023 × 10²²
Option 3) half that in 8 g He	Option 4) 558.5 × 6.023 × 10²³

Option 1) less than 3	Option 2) more than 3 but less than 6
Option 3) more than 6 but less than 9	Option 4) more than 9

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NCERT Exemplar Class 11 Biology Solutions Chapter 4 Animal Kingdom

NCERT Exemplar Class 11 Biology Solution of Chapter 4 Animal Kingdom:

Multiple Choice Questions:

Short Answer Type Questions:

Short Answer Type Questions:

Long Answer Type Questions:

Introduction of NCERT Exemplar Class 11 Biology Solutions Chapter 4:

Major Subtopics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:

NCERT Exemplar Class 11 Biology Solutions Chapter 4 - Learning Outcome:

NCERT Exemplar Class 11 Biology Solutions Chapter Wise:

Important Topics in NCERT Exemplar Class 11 Biology Solutions Chapter 4:

NCERT Exemplar Class 11 Solutions:

Check Chapter-Wise Solutions of Questions Given in Book:

Also, Read NCERT Solution subject wise

Must Read NCERT Notes subject wise

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Question (FAQs)

Also Read