NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions for Class 11 Chapter 4 Animal Kingdom enriches students with answers to all the questions provided in the NCERT textbook. The solutions are crafted by subject matter experts at CoolGyan’S, solved accurately and to the point.

Examinations can be intimidating for some students. NCERT Solutions for Class 11 Biology serves as an excellent tool for reference as well as to study from. Use of language while solving NCERT Solutions is extremely comprehensible and easy to understand.

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Access Answers to NCERT Class 11 Biology Chapter 4 – Animal Kingdom

1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?


Animals are classified on the basis of common features such as cell arrangement, body symmetry, nature of coelom, digestive tract, circulation or reproductive system. Without these common features it is very difficult to treat each organism individually, it is impossible to add new species detected every day without common features. To study diversity in animals, classification must be based on common basic features

Some other difficulties are:

(i) Tracing of interdependence amongst various animals will become difficult

(ii) Difficulty in developing new species of animals

2. If you are given a specimen, what are the steps that you would follow to classify it?


The steps to classify the specimen are:

(i) Classify level of organization: Classify the arrangement of cells in cellular and tissue level organization.

(ii) Symmetry: Classify the organism as radial or bilateral symmetry.

(iii) Classify Diploblastic or triploblastic organization

(iv) Presence or absence of body cavity

(v) Type of coelom development

(vi) Classify segmentation

(vii) Differentiate the presence or absence of notochord.

3. How useful is the study of the nature of body cavity and coelom in the classification of animals?


The coelom is the body cavity or fluid filled space lined by the mesoderm, and an animal with a coelom is called a coelomates. In some animals, the body cavity is not covered by the mesoderm; Instead, the mesoderm is a scattered cyst between the ectoderm and the endoderm. Such a body cavity is called a pseudocoelom and the animals that have them are called pseudocoelomates, for example – Aschelminthes. Some animals have no body cavity, they are called acoelomates, for example – Platyhelminthes.

Classification of body cavity and coelom are important to decide the complexity of an organism at organ level.

4. Distinguish between intracellular and extracellular digestion?


Intracellular digestionExtracellular digestion
It occurs in lower organismsOccurs in multicellular organisms
Occurs within cellsOccurs within cavity of the ailmentry canal, outside the cell
It is less efficient with no regional differentiationHighly efficient with regional differentiation
Enzymes associated are very fewLarge number of digestive glands and enzymes are required


5. What is the difference between direct and indirect development?


Direct developmentIndirect development
Occurs in fish, reptile birds and mammalsOccurs in in vertebrate amphibians
In direct development, the embryo develops into a well-grown individual without involving in a larval stage.It involves a sexually immature larval stage
Metamorphosis is absentMetamorphosis is present
Ex: Hydra, earthwormEx: Frog, butterfly

6. What are the peculiar features that you find in parasitic platyhelminthes?


The typical features of the parasitic Platyhelminthes are:

(i) Free-living parasitic forms.

(ii) The body organization observed is of tissue organ grade

(iii) Mostly hermaphrodites

(iv) Three-layered body wall – epidermis (outer covering) is often ciliate and covered with cuticle.

(v) The Digestive tract is incomplete or absent

(vi) The presence of well-defined excretory structures, such as flame cells.

(vii) Presence of anti-toxins and a thick tegument which is resistant to the digestive enzymes of host. (viii) Anaerobic respiration. No special respiratory structure was observed.

(ix) The front body part has suckers, hooks, eye spots and auricles to attach to the hosts.

(x) A highly developed reproductive system of parasitic forms.

7. What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?


The following are the causes of arthropods, which make up the largest group of animal kingdoms

(i) They have jointed legs that allow them to motile, and perform many other functions due to these jointed appendages.

(ii) A hardened skeleton made of chitin protects their body.

(iii) Hard skeletons reduce water loss from the body.

(iv) Demonstrate a different system for locomotion, respiration and reproduction.

(v) Ability to live in diverse conditions and varied habitats.

(vi) In comparison to other phyla, they are pre-developed.

(vii) Well-developed sense organs and nervous system.

(vii) Some insects exhibit pheromones that enable communication.

8. Water vascular system is the characteristic of which group of the following:

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


Form the four given options the correct answer is (c) Echinodermata

This is their characteristic. Among them is a perforated panel known as madreporite, which allows water to percolate in their systems.

9. “All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.


The presence of Notocard and paired pharyngeal gill slits is characteristic of the phylum chordate. However, the vertebrata notocard in the embryo in the subfilm is replaced by columns of bony vertebrae in adults. It is therefore said that “All vertebrates are chordates, but not all chordates are vertebrates.”

10. How important is the presence of air bladder in Pisces?


Air bladder in Pisces regulates Buoyancy which prevents fishes from sinking.

11. What are the modifications that are observed in birds that help them fly?


The variations found in birds that help fly are:

(i) The presence of feathers.

(ii) Forelimbs are turned into wings, to help with flight.

(iii) Hind limbs have scales.

(iv) They have pneumatic or hollow bones that lighten the skeleton

(v) Absence of urinary bladder causes net body weight loss and facilitates them to fly

(vi) Their streamlined body provides less resistance and enables longer flight

12. Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?


No, the number of eggs or young ones produced by an oviparous and viviparous mother are not equal, the number of eggs produced by oviparous mothers is more comparatively because in oviparous animals, fertilization talks place outside the uterus whereas in viviparous animals’ development takes place inside the uterus which makes successful incubation of young animals lesser.

When eggs are present outside, there is a risk of getting eaten by predators due to their immobility. Therefore, in order to sustain the progeny, there is a requirement for more of eggs.

13. Segmentation in the body is first observed in which of the following:

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


Form the four given options the correct answer is (c) Annelida

14. Match the following:

Column IColumn 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 IColumn 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.


Some animals that are found parasitic in humans are as follows:

i. Ancylostoma (Hookworm)

ii. Taenia (Tapeworm)

iii. Enterobius (Pinworm)

iv. Wuchereria (Filarial worm)

v. Ascaris (Roundworm)

NCERT Solutions for Class 11 Biology Chapter 4 – Animal Kingdom

NCERT Solutions for Class 11 Biology Chapter 4 the Animal Kingdom is covered under Unit 1 in Biology – Diversity in the Living World. Questions appearing from this unit constitutes for about 10% of the question paper as per past trends, hence students are required to concentrate on understanding concepts covered in this unit.

List of subtopics covered in Chapter 4 – Animal Kingdom:

4.1Basis of Classification
4.2Classification of animals

NCERT Solutions for Class 11 Biology Chapter 4 – Animal Kingdom

Biology is a vast subject. NCERT Solutions provide answers to all the questions completely, developed accurately for the benefit of students. Chapter Animal kingdom explains the differences in structure and form of different animals.

There are a few fundamental features that are common to various individuals in relation to the organization of cells, body symmetry, nature of coelom, pattern of different systems such as digestion, circulatory or reproductive systems. These are the fundamental features that form the basis for the classification of animals, some of these are explained in detail in the chapter.

Key Features of NCERT Solutions for Class 11 Biology Chapter 4 – Animal Kingdom

  • Simple and easy to understand
  • Solutions framed by subject matter experts
  • Solutions are provided as per the expected answering pattern
  • NCERT Solutions are available to download
  • Efficient and effective study tool

Frequently Asked Questions on NCERT Solutions for Class 11 Biology Chapter 4

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

Some animals that are found parasitic on human beings from the Chapter 4 of NCERT Solutions for Class 11 Biology are –
1. Ascaris (Roundworm)
2. Taenia (Tapeworm)
3. Enterobius (Pinworm)
4. Ancylostoma (Hookworm)
5. Wuchereria (Filarial worm)

Is the NCERT Solutions for Class 11 Biology Chapter 4 free of cost?

Yes, the NCERT Solutions for Class 11 Biology Chapter 4 are completely free of cost. At CoolGyan’S, the subject matter experts design the solutions to help students understand the concepts efficiently. The solutions contain explanations in a simple language to boost the exam preparation of students. Students can refer to the NCERT Solutions from CoolGyan’S while answering the textbook questions to understand the complex topics easily. Both the chapter wise and exercise wise format of solutions can be downloaded and accessed by the students without any time constraints.

What questions can I expect from the Chapter 4 of NCERT Solutions for Class 11 Biology in the exam?

The Chapter 4 of NCERT Solutions for Class 11 Biology is categorised under the Unit 1. To know the questions which can be expected from this chapter, students are recommended to collect the previous year question papers and work on them for a better result. As per the recent trends, it is found that about 10% of the questions in the exam might appear from this unit. The differences in the structure and form of different animals are explained in brief under this chapter. To understand the fundamental concepts, students can also make use of the online study materials from CoolGyan’S.