The given graphs show number and average biomass of different organisms present in an aquatic ecosystem.

Select the correct option regarding the food chain formed by interlinking organisms W, X, Y and Z.

Options

A. X could be a producer and forms the first link in the food chain formed by interlinking these organisms.
B. Y and W could be primary and secondary consumers respec tively in the food chain formed by interlinking these organisms .
C. The correct relation of these organisms in the food chain is `X to W to Z to Y`.
D. If a population of an exotic species is introduced in this community which exclusively feeds on X, then populations of Z and W will be negatively affected.

Answer

B

Explanation

In an aquatic ecosystem, the members of successive higher trophic level are fewer than the previous one and biomass of successive trophic level is higher than the previous one. On the basis of this, the correct relation of these organisms in the food chain is `Z to Y to W to X`. Therefore, Z is producer Y is primary consumer, W is secondary consumer and X is top consumer. If exotic species that exclusively feeds on X, is introduced then population of W and Z will increase.