Question

Which of the following statements about food chain are correct? 

(i) lt includes repeated eating i.e., each group eats the other and is subsequently eaten by -some other group of organisms. 

(ii) lt shows a series of branching lines and unidirectional flow of energy. 

(iii) lt shows the unidirectional flow of energy and proceeds in a progressive straight line

(iv) lt may consists of more than ten trophic levels depending upon the type of ecosystem. 

(A) (i) and (ii) only 

(B) (i) and (iii) only 

(C) (ii) and (iv) only 

(D) (i),(iii) and (iv) only

Answer 1

Correct option  (B) (i) and (iii) only 

Explanation:

 A food chain does not show branching lines. It is always straight and proceeds in a progressive straight line. Usually a food chain consists of three or four trophic levels but in few food chains, there may be a maximum of five trophic levels.