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NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom

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NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom - Free PDF Download

Class 11 Biology Chapter 4 NCERT Solutions are essential study materials that will help students to secure good marks in the exam. Expert and proficient science teachers prepared the Animal Kingdom Class 11 NCERT Solutions. The NCERT Solutions comprise precise answers, along with diagrams and explanations. The questions presented in solution books are from latest edition of NCERT textbooks. 


NCERT Solutions for Class 11


Class 11 Biology

Chapter Name:

Chapter 4 - Animal Kingdom


Text, Videos, Images and PDF Format

Academic Year:



English and Hindi

Available Materials:

Chapter Wise

Other Materials

  • Important Questions

  • Revision Notes

Note: 👉Prepare for Your Future in Medicine with the NEET Rank and College Predictor 2024.

Download the NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom to get answers to all the questions in the chapter. The solutions are crafted by subject matter experts, accurately solved, and according to the latest CBSE syllabus. The solutions are easily accessible and free to download.

Important Topics Covered in NCERT Solutions for Class 11 Biology Chapter 4

Chapter 4 of NCERT Class 11 Biology is included under Unit 1. To answer all types of questions from this chapter, students must first know the topics they’ll learn in this chapter, which are as follows:

  • Basis of Classification

  • Levels of Organisation

  • Symmetry

  • Diploblastic and Triploblastic Organisation

  • 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

  • Class – Cyclostomata

  • Class – Chondrichthyes

  • Class – Osteichthyes

  • Class – Amphibia

  • Class – Reptilia

  • Class – Aves

  • Class – Mammalia

Animal Kingdom Chapter at a Glance - Class 11 NCERT Solutions

Animal Kingdom

Animal Kingdom

Competitive Exams after 12th Science

Access NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom

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. 

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.

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.

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 and suckers to get attached inside the body of the host. 

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.

Taenia (Tapeworm) and Fasciola (liver fluke) are examples of parasitic platyhelminths.

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 


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:


Name of Organism



Taenia solium 



Fasciola hepatica



Ascaris lumbricoides



Wuchereria bancrofti





Animal Kingdom Class 11 NCERT Solutions PDF Download

The Animal Kingdom Class 11 NCERT PDF will grant you a basic idea about the chapter. It will help you to understand the study of animals. The format of the answers will assist you in learning the chapter very well. Students can download the PDF of Animal Kingdom Class 11 NCERT Solutions to solve the questions and understand the chapter. 


CBSE Class 11 Biology Chapter 4 NCERT Solutions

The CBSE Class 11 Biology Chapter 4 NCERT Solutions will help you to understand the study of living organisms. Chapter 4 Biology Class 11 NCERT Solutions will help you to learn about the classifications of animals based on various features such as the distinct patterns of digestive, circulatory, or reproductive systems, different arrangements of cells, and body symmetry. The chapter Animal Kingdom is important and will help you score high in the exam.

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

Animal Kingdom Class 11 NCERT Solutions - Weightage Marks

The NCERT solution for Class 11 Biology Chapter 4  will build a strong understanding of the textbook questions and also help you learn the question patterns and how to write an answer for a particular type of question. The overall marks for Biology are 70 marks for theory and 30 marks for the practical exam. Class 11 Biology Chapter 4 NCERT Solutions is a part of unit 1 Animal Kingdom. The marking scheme for unit 1 holds a weightage of 10 marks. The Animal Kingdom chapter will carry 2 to 5 marks, excluding Viva and Practical Records. These solutions will guide the students regarding the chapter. 


Benefits of Class 11 Biology NCERT Solutions Chapter 4 

Class 11 Biology NCERT Solutions Chapter 4 will help the students to understand the chapter accurately. Here are some of the benefits of studying the Animal Kingdom NCERT Solutions Class 11.

  • The questions and answers of the chapter are accurate and precise.

  • 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 give a brief knowledge of the subject matter and save a lot of time during the exam preparation.

  • All the answers provided in the PDF are according to the latest CBSE guidelines. 

  • Long and short answers, along with the mock test, are also available in the NCERT Solutions. 

  • The PDF of Class 11 Biology Chapter 4 NCERT Solutions is easily accessible and free to download. 

  • All essential questions are covered in the NCERT Solutions of Class 11 Biology Chapter 4. Students will not have any difficulty gathering the study materials.

Therefore, the Animal Kingdom NCERT Solutions Class 11 will help the students in understanding the chapter and secure good marks in the exam. So, students are highly recommended to download the free PDF of NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom and read it thoroughly to be able to answer correctly in the exams and score higher. 

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

1. What is the importance of body coelom and cavity in the classification of animals?

Ans: The coelom is the fluid-filled or body cavity space followed by the mesoderm. Animals possessing coelom are called coelomates. The body cavity in some animals is not filed by mesoderm; instead, it is presented as deranged pouches in between the endoderm and ectoderm. This body cavity is called pseudocoelom, and the animals who are possessing them are known as pseudocoelomates, for example – aschelminthes. Animals whose body cavity is absent are referred to as acoelomates, example – Platyhelminthes. The classification of coelom and body cavity are essential to determine the complexity of an animal at the organ level.

2. Why are the arthropods the largest species among the animal kingdom?

Ans: Arthropods are the most thriving animals and form the largest group of the Animal Kingdom. They have captured land, sea and air and are known as the three fourth of currently identified living and fossil organisms. They rank in distribution from mountain peaks to the deep sea. The thick, non-living chitinous integument develops the exoskeleton which shields the organism from predators, prevents water loss and helps to resist the temperature up to 100°C or more. They can reproduce very fast, and in less time. Cockroaches, an example of arthropods can even endure nuclear radiations. All these factors make arthropods the largest species among animals.