ALLEN Coaching
ApplyRegister for ALLEN Scholarship Test & get up to 90% Scholarship
Search Colleges, Exams, Schools & more
NCERT Exemplar Class 11 Biology Solutions Chapter 4 Animal Kingdom
Edited By Irshad Anwar | Updated on Jun 05, 2025 08:41 AM IST
The NCERT Exemplar Class 11 Biology Solutions Chapter 4 Animal Kingdom guides students with the fundamentals of how animals are classified according to important characteristics such as body organisation, symmetry, body cavity (coelom), segmentation, and how animals develop as embryos. The NCERT Exemplar begins by describing how the system of classification and various criteria used to distinguish animal phyla work. It separates animals into two broad categories: chordates (those possessing a notochord) and non-chordates (those lacking one), and discusses why this distinction is important for classification purposes.
This Story also Contains
- Detailed Answers to the NCERT Exemplar for Class 11 Science Chapter 4 Animal Kingdom (Multiple Choice Questions)
- Access Answers to Chapter 4 Animal Kingdom NCERT Exemplar Class 11 Science (Very Short Answer)
- Find Answers to Class 11 Science NCERT Exemplar Chapter 4 Animal Kingdom (Short Answer)
- Get Answers to Class 11 Science NCERT Exemplar Chapter 4 Animal Kingdom (Long Answer)
- Approach to Solve Questions of Class 11 Biology Chapter 4
- Important Topics from Class 11 Biology Chapter 4
- Important Question in Class 11 Biology Chapter 4
- NCERT Exemplar Class 11 Biology Solutions Chapter Wise
The chapter also explains the various levels of organisation present in animals—cellular, tissue, organ, and organ system levels—demonstrating how animals have evolved increasingly complex throughout history. Large animal groups or phyla such as Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata, and Chordata are covered, with their characteristics and examples are explained well. These NCERT Class 11 Biology Solutions are important for understanding the classification of animals, their structural variation, and their phylogenetic relationships within the animal kingdom.
Detailed Answers to the NCERT Exemplar for Class 11 Science Chapter 4 Animal Kingdom (Multiple Choice Questions)
Different forms of questions, like MCQs, short answers, and long answers with the required diagrams, are provided below. Practising these will help you understand the pattern and these concepts easily and effectively.
Question:1
In some animal groups, the body is 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) MetamerismExplanation: -
The body in some animals 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, is the reproduction cycle of an organism alternating between sexual and asexual mode. 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 the 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 the 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. Amphibians, 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 except crocodiles, which possess a four-chambered heart. The division in their heart is due to the incomplete interventricular septum, in the ventricles. If we talk about the heart in birds and mammals, it is four-chambered, and there is a complete division of the interventricular septum in the 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 option (d), Warm-bloodedExplanation:
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 a 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 body weight 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 option (c), Monkey, Chimpanzee, Man.Explanation:
Monkeys, chimpanzees, and men 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 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 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 show 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 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 insects, including cockroaches, 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 aggregate-level | ii) Fasciola |
C. Tissue Level | iii) Spongilla |
D. Organ System Level | iv) Obelia |
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
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 |
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
Access Answers to Chapter 4 Animal Kingdom NCERT Exemplar Class 11 Science (Very Short Answer)
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 as the reproduction cycle of an organism alternating between sexual and asexual modes.Question:4
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 the entire skin. Examples are Trygon and Pritis. Cycloid scales are exemplified by having a smooth outer margin. Examples are Catla, ClariasQuestion:7
Mention two modifications in reptiles required for terrestrial mode of life.
Answer:
The two modifications in reptiles required for terrestrial mode of life are as below:1. Internal fertilisation is required to make the chances of the survival of young ones better.
2. The body is to be covered with dry and cornified skin and epidermal scales.
Question:8
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 in rocks which is used by molluscs as their habitat.Question:10
Answer:
Bioluminescence is a phenomenon that involves the 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 of 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 ones with cells arranged in two embryonic layers. For Example, Coelenterates whereas 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: Ascarisb. 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 terms in the space provided.
a. Blood-filled cavity in arthropods __________________________.
b. Free-floating form of cnidaria _____________________________.
c. Stinging organ of jellyfishes ______________________________.
d. Lateral appendages in aquatic annelids ___________________.
Answer:
a. A blood-filled cavity in arthropods: Haemocoelb. Free-floating form of cnidaria: Medusa
c. The stinging organ of jellyfish: Nematocyst
d. Lateral appendages in aquatic annelids: Parapodia
Question:15
Animals Locomotory a. Octopus b. Crocodile c. Catla d. Ctenoplana | Organ i. Limbs ii. Comb plates iii. Tentacles iv. Fins |
Answer:
a. Octopus – Tentaclesb. Crocodile – Limbs
c. Catla – Fins
d. Ctenoplana – Comb plates
Find Answers to Class 11 Science NCERT Exemplar Chapter 4 Animal Kingdom (Short Answer)
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 of 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 a series of vessels. Examples of the open circulatorysystem 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, frogs, cockroaches,and silkworms.
Question:2
Answer:
In the case of radial symmetry, an individual’s body can be divided into equal halves by any plane passing through the longitudinal axis.Examples of Radial symmetry are Coelenterates, Ctenophores, and 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 and arthropods.
Question:3
Answer:
Two-chambered hearts: Chrondrichytes and osteocytesThree-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 tubulesThe 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
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 habitatb. 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
Answer:
For the survival of Endoparasites inside a host body, they need to adapt to the following mentioned conditions: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 a good adaption feature.
5. Loss of digestive system.
Question:7
Match the following and write the correct choice in the space provided.
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 shellb. 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 of the heart, and the cells and tissues are directly bathed whereas, in the closed circulatory system, the bloodcirculates throughout the body with the assistance of a series of vessels.
b) Oviparous refers to the Laying of 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.
d) Coelomates are the animal possessing no coelom whereas Pseudocoelomates are animals with a 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 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 a 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 habitats, 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 habitats with a bony endoskeleton. Some of the examples are Freshwater: Labeo (Rohu), Marine: Hippocampus (Sea horse), Aquarium: Betta (Fighting fish).
b) In the 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 are ascidia and salpa Examples of Cephalochordates are 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 heartb) 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 – Icthyophisb. 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 a mammary gland
Answer:
a. An example of a viviparous animal – Panthera leob. An example of a fish possessing a poison sting – Trygon
c. An example of a fish possessing an electric organ is torpedo
d. An example of an organ, which regulates buoyancy is the air bladder
e. An example of an animal, which exhibits alternation of generation – is Obelia
f. An example of an oviparous animal with a mammary gland an echidna
Question:13
The 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 glandb. Leech – Nephridia
c. Locust – Malpighian tubule
d. Liver fluke – Flame cells
e. Sea urchin – Absent
f. Pila – Metanephrida
Get Answers to Class 11 Science NCERT Exemplar Chapter 4 Animal Kingdom (Long Answer)
Question:1
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 absent Their heart is dorsal CNS is central, solid, and double Gill slits are absent |
Question:2
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 the 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. E.g. Platyhelminthes. Instead of having 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
Answer:
The external features and habitats of animals belonging to the class, amphibia and reptilia are as follows: -Amphibia
1. Amphibians are thin and have smooth skin which can live on both land and water.
2. They have a pair of limbs.
3. Their eyes have eyelids.
4. A tympanum represents 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 crocodiles, turtles 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 the sexes are separate, and fertilisation is internal. They have a couple of limbs which are used for walking, burrowing, climbing etc. They have mammary glands, which produce 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 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 part of a ‘’food web.’’
- In total, there are more than seven million different animal species.
- Animals breathe oxygen in and then release carbon dioxide.
Must Read NCERT Notes subject-wise
- NCERT Notes for Class 11 Maths
- NCERT Notes for Class 11 Physics
- NCERT Notes for Class 11 Chemistry
- NCERT Notes for Class 11 Biology
Approach to Solve Questions of Class 11 Biology Chapter 4
Here is a step-by-step solution to the questions of Animal Kingdom:
- Learn the key features that are used to classify animals, such as their body shape and body parts.
- Remember each animal group's special characteristics.
- Don't confuse words that sound alike; be aware of what each word is.
- Refer to pictures and charts to know more about animal groups.
- Practice questions from your textbook to prepare for exams.
- Learn some typical animals in each category.
- Keep monitoring yourself to find out what you need to learn more.
- In case of confusion, read the answers attentively to grasp the reasons why they are correct
Also, Read NCERT Solution subject-wise
- NCERT Solutions for Class 11 Maths
- NCERT Solutions for Class 11 Physics
- NCERT Solutions for Class 11 Chemistry
Important Topics from Class 11 Biology Chapter 4
Animal Kingdom is a fundamental chapter that introduces the classification of animals based on key features like body organisation, symmetry, body cavity, and patterns of development. This chapter also covers the distinguishing characteristics of major animal phyla, helping students understand evolutionary relationships and the diversity of animal life.
| Basis of Classification |
| Levels of Organization |
| Body Symmetry |
| Coelom (Body Cavity) |
| Diploblastic vs. Triploblastic |
| Segmentation (Metamerism) |
| Digestive System |
| Circulatory System |
| Major Phyla and Their Characteristics |
| Chordata and Vertebrate Classes |
| Direct vs. Indirect Development |
| Examples and Diagrams |
NCERT Exemplar Class 11 Solutions:
Important Question in Class 11 Biology Chapter 4
Animal Kingdom dives into the wide variety of animals and their systematic organisation based on features such as body organisation, symmetry, coelom, segmentation, and organ systems. These organisations are important to NEET since questions often assess knowledge regarding animal phyla, distinguishing features, and evolutionary links.
Q1. An important characteristic that hemichordates share with chordates is
A. Absence of notochord
B. Pharynx without gill slits
C. Pharynx with gill slits
D. Ventral tubular nerve cord
Answer:
Both hemichordates and chordates possess pharyngeal gill slits, which are crucial for respiration and filter feeding in aquatic forms.
Hence, the correct option is C. Pharynx with gill slits
Also, check the NCERT Books and the NCERT Syllabus here
- NCERT Books Class 11 Biology
- NCERT Syllabus Class 11 Biology
- NCERT Books Class 11
- NCERT Syllabus Class 11
NCERT Exemplar Class 11 Biology Solutions Chapter Wise
The chapter-wise links are given below:
Frequently Asked Questions (FAQs)
1. What are the fundamental features used to classify animals in this chapter?
Animals are classified based on key characteristics such as levels of organization (cellular, tissue, organ, organ system), body symmetry, nature of coelom (body cavity), segmentation, and patterns of digestive, circulatory, and reproductive systems.
2. What is metamerism and in which animal groups is it found?
Metamerism, also known as segmentation, is the division of the body into repetitive segments, each with similar organs. This feature is characteristic of phyla such as Annelida, Arthropoda, and Chordata.
3. Which animals are parasitic on humans as discussed in this chapter?
Common parasitic animals on humans include Ascaris (roundworm), Taenia (tapeworm), Enterobius (pinworm), Ancylostoma (hookworm), and Wuchereria (filarial worm).
4. What is the difference between oviparous and viviparous animals?
Oviparous animals lay eggs, with development occurring outside the mother's body, while viviparous animals give birth to live young, with development occurring inside the mother's body. Oviparous animals typically produce more eggs due to a higher risk of predation.
5. Why is the study of the animal kingdom important for students preparing for medical and biology exams?
6. Why is the classification of the Animal Kingdom important in Biology?
Helps organize the vast diversity of animals.
Makes it easier to study, identify, and understand relationships between organisms.
Aids in understanding evolution and ecological roles.
Essential for systematic naming and research
7. How are NCERT Exemplar solutions useful for NEET preparation?
They provide practice with MCQs and conceptual questions similar to NEET.
Strengthen problem-solving skills and conceptual clarity.
Help identify weak areas for focused revision
8. What are the characteristic features of different phyla in the Animal Kingdom?
Porifera: Pores, canal system, no tissues/organs.
Cnidaria: Stinging cells, radial symmetry.
Ctenophora: Comb plates, bioluminescence.
Platyhelminthes: Flat, unsegmented body.
Aschelminthes: Round, unsegmented body, pseudocoelom.
Annelida: Segmented body, true coelom.
Arthropoda: Jointed legs, exoskeleton.
Mollusca: Soft body, shell (usually).
Echinodermata: Spiny skin, water vascular system.
Hemichordata: Notochord in some form, worm-like.
Chordata: Notochord, dorsal nerve cord, pharyngeal slits
9. Where can I download NCERT Exemplar Class 11 Biology Chapter 4 solutions PDF?
You can download the solutions from educational websites like Careers360.
The official NCERT website also provides exemplar PDFs
10. What is the best way to remember the classification of the Animal Kingdom?
se mnemonics for the order of phyla (e.g., "Porcupines Can Play And Make Every Happy Child").
Make short notes or flashcards for each phylum’s key features.
Practice diagrams and flowcharts.
Revise regularly and solve exemplar questions to reinforce memory
Also Read
Articles
Popular Questions
A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
A particle is projected at 600 to the horizontal with a kinetic energy . The kinetic energy at the highest point
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
In the reaction,
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?
| Option 1)
0.02 |
Option 2)
3.125 × 10-2 |
| Option 3)
1.25 × 10-2 |
Option 4)
2.5 × 10-2 |
Colleges After 12th
Popular Course After 12th
Study Resources, Applications and Opportunities
NEET/JEE Coaching Scholarship
ApplyGet up to 90% Scholarship on Offline NEET/JEE coaching from top Institutes
NEET Most scoring concepts
Get nowThis ebook serves as a valuable study guide for NEET 2025 exam.
NEET Previous 10 Year Questions
Get nowThis e-book offers NEET PYQ and serves as an indispensable NEET study material.
JEE Main Important Physics formulas
Get nowAs per latest syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
JEE Main Important Chemistry formulas
Get nowAs per latest syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
News and Notifications
Ask
Question
Student Community: Where Questions Find Answers
Back to top