Question

Assertion : In a food chain members of successive higher levels are levels in number.

Reason : Number of organisms at any trophic level depends upon the availability of organisms which sen'e as food at the lower level.

(a) Both A and R are true and R is the correct explanation of A  

(b) Both A and R are true but R is not correct explanation of A  

(c) A is true but R is false  

(d) A and R are false

Answer 1

Correct option (a) 

Explanation :

In a food chain the number of animals and biomass at the lower trophic level is abundant. Successive links of carnivores decrease rapidly in number until there are very few carnivores at the top.