NCERT Class 11-Biology: Chapter – 4 Animal Kingdom (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 7:

Menion two modifications in reptiles required for terrestrial mode of life.


Following are the two modifications in reptiles required for terrestrial mode of life:

(a) Dry and cornified skin and epidermal scales.

(b) Internal fertilization

Question 8:

Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.


Arthropods have chitinous exoskeleton, e. g. cockroach. Mollusks have calcareous shell, e. g. Pila.

Question 9:

What is the role of radula in mollusks?


Radula is a file-like rasping organ found in mollusks. It helps in scraping and scratching the food. It also helps in creating depressions in rocks. Such depressions are used by these animals as home.

Question 10:

Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.


Pleurobrachia and Ctenoplana are animals which exhibit bioluminescence. These animals belong to the phylum Ctenophora.

Question 11:

Write one example 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 ________


(a) Frog

(b) Pigeon

(c) Snake

(d) Ascaris

Question 12:

Differentiate between a diploblastic and a triploblastic animal.


There are two embryonic layers in diploblastic animals, viz. ectoderm and endoderm. There are three embryonic layers in triploblatic animals, viz. ectoderm, mesoderm and endoderm.

Question 13:

Give an example of the following

a. Round worm

b. Fish possessing poison sting

c. A limbless reptile/amphibian

d. An oviparous mammal


(a) Ascaris

(b) Trygon

(c) Ichthyophis

(d) Platypus

Question 14:

Provide appropriate technical term in the space provided.

a. Blood-filled cavity in arthropods ________.

b. Free-floating form of cnidaria ________.

c. Stinging organ of jelly fishes ________.

d. Lateral appendages in aquatic annelids ________.


(a) Haemocoel

(b) Medusa

(c) Nematocytes

(d) Parapodia

Question 15:

Match the following:

Question 15 Table of Animal and Locomotory Organ
AnimalsLocomotory Organ
b.Crocodileii.Comb plates


(a) (iii) , (b) (i) , (c) (iv) , (d) (ii)