Question

If tree = A, large Birds = B, Insects = C and small birds = D, then in a single tree ecosystem, the pyramid of number stays correct in all of the following except

• A. C > D > A
• B. D > A > B
• C. C > B > A
• D. D > B > C

Answer 1

The correct option is B D > A > B

A "pyramid of numbers" shows graphically the population of each level in a food chain. A large population of insects feeds upon a very big tree. The insects, in turn, are eaten by small birds which in turn are fed upon by big birds. It showing the interaction between trees, insects, birds and big birds. Pyramid of number is spindle-shaped as the number of insects is maximum. The number of trees and birds are less than the insects. The number is gradually decreasing at each trophic level.

The correct sequence is “C>D>B>A”.

So, according to this incorrect sequence is”D>A>B”