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

The number of primary producers within a specified area would be maximum in

Assertion: Pyramid of energy is always upright.
Reason: Energy at a lower trophic level is always more than at a higher level.

In a food chain, the total amount of living material is depicted by

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.