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NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom

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NCERT Solutions Chapter 4 -Animal Kingdom Class 11 Questions and Answers FREE PDF Download

Embark on your journey with Vedantu through Class 11 Biology Chapter 4 Animal Kingdom questions and answers. Students will learn about the inside topics such as all the phylum, commonly Anelida, Arthropoda, Basis of classification, etc.

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By referring to the Animal Kingdom class 11 Biology NCERT solutions, students gain comprehensive insights into the core concepts outlined in the curriculum. Class 11 Biology Chapter 4's question answers are designed by Vedantu experts and are updated according to the revised Class 11 Biology Syllabus. Get started with Vedantu and embark on a journey of academic excellence.

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Access Biology Chapter 4 Animal Kingdom Class 11 NCERT Solutions

1. What are the Difficulties that you Would Face in the Classification of Animals if Common Fundamental Features are Not Taken Into Account? 

Ans. Common fundamental features are taken into account in the classification of living organisms. But if we consider specific characteristics, then each organism will be placed in a separate group and the entire objective of classification would not be achieved.


Another difficulties are:

  • In comparing different organisms and judging their evolutionary significance the classification of animals is also important.

  • If only one character is considered, then this objective would not be achieved.

  • The delicate balance between organisms will become harder to untangle.

  • Increased obstacles for future studies on animal symbiosis.

  • Development of new species of animals will become difficult.


2. If You are Given a Specimen, What are the Steps that You Would Follow to Classify It? 

Ans. To classify the given specimen we will consider a certain common fundamental feature that helps in the classification of living organisms. The features that can be used for classification are as follows: 


classification of living organism on the Basis of Different Characters


Based on the above-mentioned features, we can easily classify a specimen into its respective category.


3. How Useful is the Study of the Nature of the Body Cavity and Coelom in the Classification of Animals? 

Ans. The coelom is a fluid-filled space between the body wall and digestive tract that acts as a cavity for other organs. The presence or absence of body cavity or coelom plays a very important role in the classification of animals as it decides the complexity for any animal at the organ level. Based on the nature and presence of the body cavity the animals can be classified into:

1. Coelomates: These are the animals that possess a fluid-filled cavity between the body wall and digestive tract. Annelids, mollusks,  arthropods, echinoderms, and chordates are examples of coelomates. 

2. Pseudocoelomates: These are the animals in which the body cavity is not lined by the mesoderm and remains scattered in between the ectoderm and endoderm. Aschelminthes is an example of pseudocoelomates. 

3. Acoelomates: These are the animals in which the body cavity is absent. Platyhelminthes is an example of acoelomates.


Types of Coelomic Conditions


4. Distinguish Between Intracellular and Extracellular Digestion? 

Ans. The differences between intracellular and extracellular digestions are as follows:

Intracellular Digestion

Extracellular Digestion

The digestion of food occurs within the cell. 

The digestion occurs in the cavity

of the alimentary canal. 

Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole.   

Digestive enzymes are secreted

by special cells into the cavity of the alimentary canal.

Digestive products are diffused into the cytoplasm. 

Digestive products diffuse across intestinal wall into various parts of bodies

It is a less efficient method. 

It is a more efficient method of digestion. 

It mostly occurs in unicellular organisms.

It mostly occurs in multicellular organisms.



5. What is the Difference Between Direct and Indirect Development? 

Ans. The difference between direct and indirect development are as follows:


Direct Development

Indirect Development 

It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 

It is a type of development that involves a sexually immature larval stage, having different food requirements than adults. 

Metamorphosis is absent.

Metamorphosis involving the development of larva to a sexually mature adult is present.

It occurs in fishes, reptiles, birds, and mammals. 

It occurs in most invertebrates and amphibians.

Example- Hydra

Example- Frog


5. What is the Difference Between Direct and Indirect Development? 

Ans. The difference between direct and indirect development are as follows:


Direct Development

Indirect Development 

It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 

It is a type of development that involves a sexually immature larval stage, having different food requirements than adults. 

Metamorphosis is absent.

Metamorphosis involving the development of larva to a sexually mature adult is present.

It occurs in fishes, reptiles, birds, and mammals. 

It occurs in most invertebrates and amphibians.

Example- Hydra

Example- Frog



6. What are the Peculiar Features That You Find in Parasitic Platyhelminthes?

Ans. The peculiar features that are found in parasitic platyhelminths are as follows:


1. They have dorsoventrally flattened bodies and bear hooks.

2. Their body is covered with thick tegument, which protects them from the action of the digestive juices of the host.

3. The tegument also helps in absorbing nutrients from the host’s body.

4. Mostly Hermaphrodites and free-living and have organ level of organisation.

5. Incomplete digestive tract or may be absent.


Examples include: Taenia (Tapeworm) and Fasciola (liver fluke)


7. What are the Reasons That You Can Think of for the Arthropods to Constitute the Largest Group of the Animal Kingdom? 

Ans. The phylum, Arthropoda, which consists of more than two-thirds of the animal species on earth constitutes the largest group of the animal kingdom. The reasons for the success of arthropods are as follows: 

1.Presence of jointed legs that allow more mobility on land.

2.Hard exoskeleton is present which is made up of chitin that protects the body, 

3.The hard exoskeleton also reduces water loss from the body of arthropods making them more adapted to terrestrial conditions.


8. Water Vascular System is the Characteristic of Which Group of the Following: 

(a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata 

Ans. The water vascular system is a characteristic feature of the phylum Echinodermata. This system consists of an array of radiating channels, tube feet, and madreporite. It helps in locomotion, food capturing, and respiration. 


9. “All Vertebrates are Chordates but All Chordates are Not Vertebrates”. Justify the Statement. 

Ans. The presence of a notochord and paired pharyngeal gill slits are the characteristic features of the phylum Chordata. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it is said that all vertebrates are chordates but all chordates are not vertebrates.


10. How Important is the Presence of Air Bladder in Pisces? 

Ans. An air bladder is a gas-filled sac present in Pisces which helps in maintaining buoyancy. It is important as it helps fishes to ascend or descend and stay in the water current.


11. What are the Modifications that are Observed in Birds that Help Them Fly? 

Ans. Birds have undergone many structural adaptations or modifications to suit their aerial life. Some of these adaptations are as follows:  

1.They have a Streamlined body for rapid and smooth movement. 

2.Covering of body with feathers for insulation. 

3.Their forelimbs are modified into wings and their hind limbs are used for walking, perching, and swimming. 

4.The presence of pneumatic bones to reduce weight.

5.Presence of additional air sacs to supplement respiration.


12. Could the Number of Eggs or Young Ones Produced by an Oviparous and Viviparous Mother Be Equal? Why? 

Ans. The number of eggs produced by an oviparous mother will be more than the number of young ones produced by a viviparous mother. This is because, in oviparous animals, the development of young ones takes place outside the mother’s body. Their eggs are more prone to environmental conditions and predators. Therefore, to overcome the loss, more eggs are produced by mothers so that even under harsh environmental conditions, some eggs might be able to survive and produce young ones. On the other hand, in viviparous organisms, the development of young ones takes place in safe conditions inside the body of the mother. They are less exposed to environmental conditions and predators. Therefore, there are more chances of their survival and hence, less number of young ones is produced compared to the oviparous animals.


13. Segmentation in the Body is First Observed in Which of the Following: 

(a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda 

Ans. The body segmentation has first appeared in the phylum, Annelida (annulus meaning little ring)


14. Match the Following: 

Column I 

Column II 

(a) Operculum 

(i) Ctenophora 

(b) Parapodia

(ii) Mollusca 

(c) Scales 

(iii) Porifera 

(d) Comb plates 

(iv) Reptilia 

(e) Radula 

(v) Annelida 

(f) Hairs 

(vi) Cyclostomata and Chondrichthyes

(g) Choanocytes 

(vii) Mammalia 

(h) Gill slits 

(viii) Osteichthyes 


Ans. 

Column I 

Column II 

(a) Operculum

(viii) Osteichthyes 

(b) Parapodia 

(v) Annelida 

(c) Scales 

(iv) Reptilia 

(d) Comb plates 

(i) Ctenophora 

(e) Radula 

(ii) Mollusca 

(f) Hairs 

(vii) Mammalia 

(g) Choanocytes 

(iii) Porifera 

(h) Gill slits

(vi) Cyclostomata and Chondrichthyes


15. Prepare a List of Some Animals that are Found Parasitic on Human Beings. 

Ans. The list of some animals that are found parasitic on human beings is as follows:

Sl.No

Name of Organism

Phylum 

1. 

Taenia solium 

Platyhelminthes 

2. 

Fasciola hepatica

Platyhelminthes 

3. 

Ascaris lumbricoides

Aschelminthes 

4.

Wuchereria bancrofti

Aschelminthes 

5. 

Ancylostoma 

Aschelminthes



Class 11 NCERT Animal Kingdom Questions and Answers: Quick Overview of Topics Covered

List of Topics Covered in Class 11 Biology Chapter 4: Animal Kingdom

Topics

Subtopics

Basis of Classification

  • Levels of Organisation

  • Symmetry

  • Diploblastic and Triploblastic Organisation

  •  Coelom

  • Segmentation

  •  Notochord

Classification of Animals

  • Porifera

  • Coelenterate

  • Ctenophora

  • Platyhelminthes

  • Aschelminthes

  • Annelida Arthropoda

  • Mollusca

  • Echinodermata

  • Hemichordata

  • Chordata


 

Benefits of Biology Chapter 4 Animal Kingdom Class 11 NCERT Solutions

Class 11 Biology Chapter 4 Animal Kingdom questions and answers PDF will help the students to understand the chapter accurately. Here are some key features of studying the Animal Kingdom NCERT solutions Class 11.


  • The solutions of the chapters are prepared by subject experts and experienced Biology teachers to assist the students in learning the chapter quickly. 

  • NCERT Solutions briefly explains the topics and will help you learn about animal classifications based on various features, such as the distinct patterns of digestive, circulatory, or reproductive systems.

  • Students can clear their doubts and reinforce their understanding of complex topics, such as different phyla and their characteristics.

  • Biology Chapter 4 Animal Kingdom Class 11 NCERT PDF will help you learn the 6 Basic Classifications of Animal Kingdom, Symmetry, Diploblastic and Triploblastic Organisation, Coelom, Segmentation, and Notochord.

  • By following these solutions, students can efficiently manage their study time and focus on key areas, ensuring a thorough revision.


Study Materials for Class 11 Biology Chapter 4 Animal Kingdom NCERT Solutions


Conclusion

The Animal Kingdom questions and answers in Class 11 will help the students understand the chapter and secure good marks in the exam. So, students are highly recommended to download the Animal Kingdom class 11 NCERT PDF for Biology Chapter 4 and read it thoroughly to answer the exams and score higher correctly. Long and short answers, along with the mock test, are also available in Class 11 Animal Kingdom NCERT solutions. The Animal Kingdom questions and answers PDF of Class 11 Biology is easily accessible and free to download.


NCERT Solutions for Class 11 Biology FREE PDF | Other Chapter-wise Links

Below are the other chapter-wise Links for the Solutions for Biology NCERT Class 11. You can download FREE PDFs of these chapter-wise solutions to familiarise yourself with the concepts.



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FAQs on NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom

1. What are the major criteria used for the classification of animals in the NCERT Solutions for Class 11 Biology Chapter 4?

The major criteria for classification as explained in the NCERT Solutions for Class 11 Biology Chapter 4 include:

  • Levels of organization (cellular, tissue, organ, organ system)
  • Symmetry (asymmetrical, radial, bilateral)
  • Germ layers (diploblastic, triploblastic)
  • Nature of coelom (acoelomate, pseudocoelomate, coelomate)
  • Segmentation
  • Notochord presence

These features help group animals based on shared structural and functional characteristics.

2. How is the presence or absence of a coelom significant in animal classification as per NCERT Class 11 Biology Chapter 4?

The presence or absence of a coelom (body cavity) is a key classification feature:

  • Coelomates have a true, mesoderm-lined cavity (e.g., annelids, arthropods).
  • Pseudocoelomates have a cavity not fully lined by mesoderm (e.g., aschelminthes).
  • Acoelomates lack a true body cavity (e.g., platyhelminthes).

This determines organ arrangement and complexity in animals.

3. What is the difference between direct and indirect development, as defined in NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom?

Direct development occurs without a larval stage—the embryo grows into a mature individual. Indirect development features a larval stage with different characteristics from adults and requires metamorphosis to reach maturity. Direct development is seen in mammals and birds, while indirect development is found in most invertebrates and amphibians.

4. Why are arthropods considered the largest phylum in the Animal Kingdom according to NCERT Solutions?

Arthropods are the largest phylum due to their adaptive features:

  • Jointed legs for mobility
  • Protective chitinous exoskeleton
  • High reproductive capacity
  • Ability to occupy diverse environments

These characteristics contribute to their diversity and dominance (over two-thirds of known animal species).

5. How do the NCERT Solutions for Animal Kingdom help clarify the difference between classification and identification?

Classification is the scientific process of grouping organisms based on shared characteristics. Identification involves determining the exact group or species of an unknown organism. Classification provides the framework; identification applies it to individual specimen analysis.

6. What are the unique features of parasitic platyhelminthes as highlighted in Class 11 Biology Chapter 4 NCERT Solutions?

Parasitic platyhelminthes exhibit:

  • Dorsoventrally flattened bodies
  • Hooks and suckers for attachment
  • Thick tegument to resist digestive juices of the host
  • Absorption of nutrients via the body surface
  • Usually hermaphroditic

Examples include Taenia solium and Fasciola hepatica.

7. What key adaptations enable birds to fly, based on NCERT Solutions for Class 11 Biology Chapter 4?

Important adaptations allowing flight in birds include:

  • Streamlined body
  • Wings derived from forelimbs
  • Feathers for insulation and lift
  • Pneumatic (hollow) bones for reduced weight
  • Additional air sacs to improve respiration

8. Explain the functional significance of the water vascular system in echinoderms as per NCERT solutions.

The water vascular system in echinoderms (e.g., starfish) is a network of fluid-filled canals and tube feet. It enables locomotion, food capture, and respiration, making it an essential distinguishing feature of the group.

9. What are the six basic classifications of Animal Kingdom outlined in NCERT Solutions for Class 11 Biology Chapter 4?

The main classification criteria include:

  • Levels of organization
  • Body symmetry
  • Number of germ layers
  • Coelom (body cavity) type
  • Segmentation
  • Presence/absence of notochord

10. In what type of organisms is segmentation first seen, according to Class 11 Biology Animal Kingdom?

Segmentation (body division into segments) first appears in phylum Annelida (e.g., earthworm). This feature is important for improved locomotion and specialization of body regions.

11. What is the importance of studying the Animal Kingdom chapter using NCERT Solutions for Class 11?

Using NCERT Solutions for this chapter:

  • Builds a conceptual foundation for higher studies
  • Clarifies classification criteria and examples
  • Prepares students for CBSE/NEET-style questions
  • Helps in understanding evolutionary relationships among animals

12. Can the number of eggs laid by oviparous and viviparous animals ever be the same, as per NCERT Solutions for Class 11 Animal Kingdom?

No, usually oviparous animals produce a larger number of eggs compared to the fewer offspring of viviparous animals. This is because eggs developing outside the mother's body are more exposed to environmental hazards and predators, so more eggs are laid to ensure survival of some offspring.

13. What are the steps involved in classifying an animal specimen as per the NCERT Solutions for Class 11 Biology Chapter 4?

The steps for classifying a specimen include:

  • Examining basic features (body symmetry, germ layers, coelom presence, segmentation)
  • Identifying organ systems and level of organization
  • Comparing features with known phyla
  • Assigning the specimen to its respective group

14. How does the concept of ‘all vertebrates are chordates but not all chordates are vertebrates’ apply in the context of Animal Kingdom Class 11 NCERT Solutions?

All vertebrates possess the characteristics of chordates (like notochord and gill slits), but not every chordate develops a vertebral column. Thus, vertebrates are a subgroup within chordates, as detailed in the NCERT Solutions.

15. What fundamental misconceptions about animal classification does Class 11 NCERT Solutions help clarify?

NCERT Solutions address misconceptions such as:

  • Thinking all animals with similar external features are closely related (convergent evolution can mislead)
  • Confusing levels of organization and body plan (e.g., bilateral symmetry does not always mean higher complexity)
  • Misunderstanding terms like ‘segmentation’ and ‘coelom’

The solutions provide correct definitions and real examples to clear these doubts.