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

Get top class preparation for IMO right from your home: fully solved questions with step-by-step explanation- practice your way to success.

Question 4:

Fill up the blank spaces appropriately

Spaces Appropriately
Phylum/ClassExcretory OrganCirculatory OrganRespiratory Organ
ArthropodaLungs/Gills/Tracheal System


Fill up the Blank Spaces Appropriately
Phylum/ClassExcretory OrganCirculatory OrganRespiratory Organ
ArthropodaABLungs/Gills/Tracheal System

A = Malpighian Tubule/coxal glands/anternary glands/green glands

B = Open

C = Annelida

D = Mollusca

E = Feather like gills

F = Kidney

Question 5:

Match the following

Question 4 Match the Following Table
a.Amphibiai.Air bladder
b.Mammalsii.Cartilaginous notochord
c.Chondrichthyesiii.Mammary glands
d.Ostichthyesiv.Pneumatic bones
e.Cyclostomatav.Dual habitat
f.Avesvi.Sucking and circular mouth without jaws.


A. - (v) B. - (iii) C. - (ii) D. - (i) E. - (vi) F. - (iv)

a. Amphibians possess dual habitat, i.e.. , they are found in both aquatic and terrestrial habitat. Their larva is completely aquatic and adult lives in terrestrial as well as in aquatic habitat

b. Mammals have mammary glands which produce milk and feed their young ones. The mammary glands are enlarged exocrine modified sweat glands functional in female mammals.

c. Chondrichthyes have the cartilaginous rod (notochord) in the young stage which is gradually replaced by cartilage.

d. Osteichthyes have air bladder which is a vesicle or sac containing air,

e. Cyclostomes possess sucking and circular mouth without jaws which is surrounded by tentacles and the tongue bears teeth, e. g. , lamprey and nag fish.

f. Aves have light weighted bones with internal spaces filled with air called pneumatic bones and aerodynamic lungs with specialized air sacs. These are the adaptations which enable birds to fly.

Question 6:

Endoparasites are found inside the host body. Mention the special structure, possessed by these and which enables them to survive in those conditions.


The life cycles of endoparasities are more complex because of their extreme specialization. Their morphological and anatomical features are greatly simplified while emphasizing their reproductive potential. In accordance with their life style parasites evolve special adaptations such as:

1. Loss of unnecessary sense organs.

2. Loss of digestive system.

3. High reproductive capacity.

4. Presence of adhesive organs or suckers to cling on to the host.

Question 7:

Match the following and write correct choice in space provided

Question 7 Table of Animal and Characteristics
a.Pilai.Jointed appendages
c.Asteriasiii.Water vascular system
d.Torpedoiv.electric organ
e.Parrotv.Presence of shell
f.Dog fishvi.Placoid scales

a. ________, b. ________, c. ________ d. ________, e. ________, f. ________


(a) (v) , (b) (i) , (c) (iii) , (d) (iv) , (e) (ii) , (f) (vi)