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

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Short Answer Type Questions

Question 1:

Differentiate between:

a. Open circulatory system and closed circulatory system

b. Oviparous and viviparous characteristic

c. Direct development and indirect development


a. Open Circulatory System and Closed Circulatory System

Question 1 Short Answer Open Circulatory System and Closed Circulatory System
Open Circulatory SystemClosed Circulatory System
The blood is pumped out of the heart into sinuses and the cells and tissues are directly bathed in it.The blood is circulated within a network of vessels.

b. Oviparous and Viviparous.

Question 1 - B- Short Answer Table of Oviparous and Viviparous
Animals which lay eggs are called oviparousAnimals which give birth to their young ones are called viviparous

c. Direct Development and Indirect Development

Question 1 - C- Short Answer Direct Development and Indirect Development
Direct DevelopmentIndirect Development
Animals which do not have a larval stage in their development are said to exhibit direct development.Animals which have a larval stage, which do not resemble the adult in their development are said to exhibit indirect development.

Question 2:

Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.


Body symmetry is the similarity of body parts in different region and directions of the body plan. In radial symmetry, body of an individual can be divided into equal halves by any plans passing through the longitudinal axis. (e. g. , Coelentrates, Ctenophores, Echinoderms. In bilateral symmetry, body can be divided into two equal halves when the plane passes through the median longitudnal or saggital axis. (e. g. , Annelids, Arthropods)

Annelids, Arthropods

Question 3:

There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.


(a) Two chambered heart is present in organisms like fishes. Only one atria and one ventricle is present which are not separated and hence mixing of oxygenated and deoxygenated blood occurs.

(b) Three chambered heart develops after the division of auricle into right and left halves as in amphibian. Mixing of oxygenated and deoxygenated blood occurs in ventricles.

(c) An intermediary heart is present in reptiles in which ventricle get partially divided through a septum which is incomplete, e. g. , Crocodiles, thus having four-chambered heart.

(d) In four chambered heart both the auricle and ventricle are divided into two halves and thus no mixing of oxygenated and deoxygenated blood occurs, e. g. , birds and mammals.

4 Chambered Heart

2 chambered heart, (b) and (c) 3 chambered heart, (d) 4 chambered heart