Assertion :The pyramid of biomass in sea is generally inverted.
Reason:The biomass of fishes are far exceeds that of phytoplankton.

Assertion and Reason both are true and Reason is the  correct explanation of assertion.

The correct answer is Option (4)- Assertion and Reason both are true and Reason is the  correct explanation of assertion.

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

The assertion and reason are both correct.

Assertion: The pyramid of biomass in the sea is generally inverted.

This is because the biomass of phytoplankton, which are the primary producers in the ocean, is much less than the biomass of fish, which are the top predators. Phytoplankton are small and short-lived organisms, and they are constantly being reproduced. Fish, on the other hand, are large and long-lived organisms, and they can accumulate a lot of biomass over time.

Reason: The biomass of fishes far exceeds that of phytoplankton.

This is because fish are higher up on the food chain and they eat a lot of phytoplankton. For every 100 grams of phytoplankton that are eaten, only about 1 gram of fish biomass is produced. This is due to the fact that a lot of energy is lost at each trophic level.

The inverted pyramid of biomass in the sea is a paradox, but it is explained by the high turnover rate of phytoplankton. Phytoplankton are constantly being reproduced, so even though their biomass is low, they are able to support a large biomass of fish.