The biomass pyramid of a forest is:

In an ecological pyramid,the base always represents the $...A...$ and the apex represents $...B...$. Here,$A$ and $B$ represent:

Assertion : In a food chain, members of successive higher levels are fewer in number.
Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

The pyramid of biomass and the pyramid of number represent:

In a pond ecosystem,the pyramid of numbers is ............ .

Which of the following statements is incorrect regarding the pyramid of energy, while three are correct?