Question

Pyramid of energy in a river ecosystem is always

• A. upright
• B. inverted
• C. declining
• D. (a) and (b) above.

Answer 1

The correct option is A upright

The pyramid of enerygy in a river ecosystem is always upright.

The energy at producer level is maximum, followed by primary consumers (herbivores), followed by secondary consumers (carnivores).

The base of the pyramid of energy is occupied by the producers which produces food and is transferred from one trophic level to the other. This trophic level would have maximum energy.

Then from this trophic level energy is transferred to the other trophic levels during which some energy is always lost as heat in each step. Only 10% of the total energy is transferred from one trophic level to the other.

Therefore, the pyramid of enerygy in a river ecosystem is always upright.