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

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 pyramid of energy is the best representation of an ecosystem because it indicates

What is maximum in a pond-ecosystem?

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.

Which is an example of a true pyramid in an ecosystem?