Which of the following representations shows the pyramid of numbers in a grassland ecosystem?

When the number of organisms at successive levels are plotted,they assume the shape of a pyramid. This is called the pyramid of

In a forest ecosystem, a pyramid of biomass is upright. If $P$ is at the highest trophic level, $Q$ is at the second trophic level, and $R$ is at the lowest trophic level, identify $P, Q,$ and $R$ from the following options.

If a producer is a large tree that supports a number of herbivorous animals which are further attacked by ectoparasites,the pyramid of number shall be:

Choose the correct option for the given statements:
($T$ = True,$F$ = False)
$(A)$ Pyramid of energy is always upright.
$(B)$ Pyramid of number in a sea is generally inverted.
$(C)$ Pyramid of biomass in a sea is generally inverted.
$(D)$ In most ecosystems,the pyramid of number and energy are always inverted.

The given figure represents a pyramid of numbers. Which of the following is a possible scenario for the organisms at different levels?