Observe the given figure and answer the question.

Identify the statements which hold true with respect to the above figure ?

(A) The figure shows the pyramid of biomass.

(B) The value of 'D' will always be lower than 'A' in grassland ecosystem.

(C) The energy at 'A' is higher than the energy at 'D'.

(D) The energy at 'D' is higher than the energy at 'A'.

Choose the correct answer from the options given below:

(B) and (C) only

The correct answer is Option (3) - (B) and (C) only

The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top level consumer. The three types of ecological pyramids that are usually studied are (a) pyramid of number; (b) pyramid of biomass and (c) pyramid of energy.

                         Pyramid of numbers in a grassland ecosystem.

In most ecosystems, all the pyramids, of number, of energy and biomass are upright, i.e., producers are more in number and biomass than the herbivores, and herbivores are more in number and biomass than the carnivores. Also energy at a lower trophic level is always more than at a higher level.

The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.

Pyramid of energy is always upright, can never be inverted, because when energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step.

Each bar in the energy pyramid indicates the amount of energy present at each trophic level in a given time or annually per unit area.