Five Kingdom Classification — Question 2

(a) Species — Species means an organism of particular kind whose members can interbreed among themselves to produce fertile young ones.

(b) Clitellum — The clitellum is a specialized reproductive structure found in certain annelids, particularly in earthworms. It is a short cylindrical band of thick glandular skin that surrounds the body like a belt and is around one-third distance of the body from the front end in the segments 14-16.

(c) Moulting — The casting off and the regrowing of the exoskeleton is collectively called moulting. It occurs in Arthropods.

(d) Diaphragm — A muscular structure separating thorax and abdomen internally in mammals is called diaphragm.

(e) Nocturnal animals — Animals that are active during night are known as nocturnal animals.