NCERT Solutions Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions Class 11 Biology Chapter 4 Animal Kingdom: National Council of Educational Research and Training Class 11 Biology Chapter 4 Solutions – Animal Kingdom. NCERT Solutions Class 11 Biology Chapter 4 PDF Download.

NCERT Solutions Class 11 Biology Chapter 4: Overview







Chapter Name

Animal Kingdom

Exercise Solutions

NCERT Solutions 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?

Answer: There are many difficulties for Classification of animals due to vast diversity in living world are

1.) Body form of organisms some organisms are symmentricalsuch as radial, bilateral and can be asymentrical.

2.) Some animals possesses cellular level of organisations whereas others may have tissue or organ level of organisation, according to their body plan.

3.) Digestion- The mechanism of digestive system may differ from species to species.It can be intracellular of extracellular.

4.) Respiration- Respiratory system may differ according to habitat of organisms.

5.) Circulation- It can be open type or closed type.

6.) Reproduction-  can be asexual or sexual reproduction.

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

Answer: If I’ve given a specimen, the steps to classify organism are.

1.) Level of organisation.

2.) Digestion

3.) Circulation

4.) Reproduction.

5.) Symmetry of body.

3) How useful is the study of the nature of body cavity and coelom in the Classification of animals?

Answer: The body cavity and coelom are very important in Classification of animals. The animals are classified on the basis of presence or absence of cavity. The body cavity contain mesoderm which is called as coelumon the basis of coelum , the animals are classified into three categories such as:

1.) Coelomata:- The animals which contains coelum. Example: Annelids.

2.) Pseudocoelomata:- The animals which don’t have mesoderm are called as pseudocoelomata. Example: Asschelminthes.

3.) Ascoelomata:- The animals which don’t have coelum. Example: Plathelminthes.

4) Distinguish between intracellular and extracellular digestion?


Intracellular digestion.

   Extracellular digestion

1.) It occurs inside the all. 1.) It occurs in cavity gastracellular system.
2.) Lysosomal enzymes are present. 2.) Salivary organism are present.
3.) Digested food material will diffuse in cytoplasm. 3.) Digested food material diffuse in

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


      Direct development       Indirect development
1.) Larval stage are absent. 1.) Larval stage is present
2.) No intermidiatestage. 2.) Intermidiate stages are present.
3.) Absence of metamorphosis. 3.) Presence of metamorphosis.

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

Answer: The peculiar features of parasitic Plathelminthes are

i.) Body organization is tissue level.

ii.) Digestion or digestive tract is not present.

iii.) They are free living organisms.

iv.) Flame cell are present.

v.) Excretorysystem is well developed.

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

Answer: The arthropods constitute the largest group of animals kingdom. The enormous diversity is present in arthropods due to adaption in existing environment such as walking, swimming, crawling and defence.They  have well developed locomotoryorgans.


In case you are missed :- Previous Chapter Solution


8.) Water gvascular system is the characteristic of which group of the following: (a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata

Answer: The correct option is C, Echinodermata water vascular system is the characristics of Echinodermata.

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

Answer: All vertebrates are chordates but all chordates are not vertebrates . All the character possess notochord .In the sub-phylum vertebrata, notochord is present which get replaced in life cycle up to adult stage .In case of chordates ,this notochord is not replaced by other organelles.

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

Answer: The presence of air bladder is very important in Pisces (fishes) .Air bladder contain oxygen in addition to this it helps in swimming in deep sea for example , Hippocampus and Labea.

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

Answer: The modification observed in birds are –

1.) Bones are small, light weight,which are helpful to reduce body size.

2.) Feathers are present , to fly in heavy air.

3.) The well developed eyes are present.

4.) One ovary and one oviduct is present.

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

Answer: In comparison with oviparous and viviparous .The oviparous produces more more eggs as compared to viviparous,some will get die due to no parental care. Viviparous has less number of eggs, but less chances to die due to parental care.

13.) Segmentation  in the body is first observed in which of the following: (a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda.

Answer: The option is b. It is Annelids . Due to metamerism.

14.) Match the following:

(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


A Operculum 1 Osteichthyes
B. Parapodia 2 Annelida
C. Scales 3 Reptilian
D. Comb plates 4 Ctenophore
E. Radula 5 Mollusca
F. Hairs 6 Mammalia
G. Choanocytes 7 Pronifera
H. Gill sites 8 Cyclostomata and Chondrichthyes

15.) Prepare a list of some animals that are found parasitic on human beings


Parasite    Human body parasite
1.E-coli Intestine
2.Entamoeba histolytica Intestine
3.Tryponosoma Blood
4.Ascaris Small intestine

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