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

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Question 12:

Give an example for each of the following

a. A viviparous animal

b. A fish possessing a poison sting

c. A fish possessing an electric organ

d. An organ, which regulates buoyancy

e. Animal, which exhibits alternation of generation

f. Oviparous animal with mammary gland


(a) Chimpanzee

(b) Torpedo

(c) Electric ray

(d) Air bladder

(e) Obelia

(f) Platypus

Question 13:

Excretory organs of different animals are given below. Choose correctly and write in the space provided.

Question 13 Table of Animal and Excetory Organ/Unit
AnimalExcetory Organ/Unit
c.Locustiii.Flame cells
d.Liver flukeiv.Absent
e.Sea urchinv.Malpighian tubule
f.Pilavi.Proboscis gland

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


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

Long Answer Type Questions

Question 1:

Give three major differences between chordates and non-chordates and draw a schematic sketch of a chordate showing those features.


Question 1 Table of Chordates Non-Chordates
1. A notochord is present at some stage in the life cycle of a chordate.Notochord is not present at any stage in the Life cycle of a non-chordate.
2. Gill-slits are present in the pharynx either in embryo or in adult organism.Pharyngeal gill slits are absent.
3. Tail is present at some stage in the life of the chordate.Tail is absent in non-chordates.
4. Heart is ventrally located.Heart (if present) is dorsally located,
5. Central nervous system is dorsal and hollow in chordates.Central nervous system in non-chordates is solid and ventrally located.

Schematic sketch illustrating important characters of chordates is shown below

Schematic Sketch Illustrating Important