Q141 of 525 Page 254

Why amphibians are present close to the water bodies?

Amphibians require water for fertilization and also for keeping body surface moist, hence they are present close to the water bodies.

139

Give one example of (a) cartilaginous fish; (b) bony fish.

140

Give the scientific name of the following :

(a) Mosquito fish; (b) Flying fish.

142

What do you understand by the term tetrapoda? Name two classes belonging to tetrapoda.

143

Name the following

(a) Organism in which external ear (pinna) is present

(b) Organism in which nictitating membrane is present.