Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour?
(i) Unavailability of food.
(ii) (ii) Extreme weather conditions.
(iii) (iii) Over crowding.
(iv) (iv) Lack of nesting areas.

(a) ii & iii;
(b) i & ii;
(c) i & iv
(d) ii & iv.

Question

Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour?
(i)	Unavailability of food.
(ii)	(ii) Extreme weather conditions.
(iii)	(iii) Over crowding.
(iv)	(iv) Lack of nesting areas.

(a)	ii & iii;
(b)	i & ii;
(c)	i & iv
(d)	ii & iv.

Accepted Answer

Answer is (b) i & ii;
Explanation:
Migration of birds is a process of moving to different habitats due to adverse climatic condition. Because of extreme weather conditions birds fail to gather food and they cannot lay their eggs.

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