Question

Biomass decreases when-pg<R, pg=R, pg>R

Answer 1

The correct answer is - Pg < R.

The energy produced the autotrophs at the first levels of the ecosystem is called as primary productivity. If the amount of one component is known then the amount of the other components can also be computed. So, the entire energy uptake by the plants can be measured by calculating the total amount of sugar produced. This quantity is called as gross primary production or gross productivity (Pg). R stands for rate of respiration.

When Pg is equal to respiration, there is no change in energy content. When Pg is less than R, biomass decreases, and Pg is greater than R, there is an accumulation of biomass.

Answer 2

Energy is constantly lost as we move to higher trophic levels. This is genuine whether we are thinking about earthly or aquatic frameworks. 

However, when biomass is measured or evaluated, it is measured or assessed at a correct moment of time.

Biomass alludes to the quantity of living beings in a specific region with respect to their mass (not the quantity of people). In terrestrial frameworks, biomass diminishes as trophic level increases. In terrestrial frameworks, biomass diminishes as trophic level increments. Sea-going frameworks take a marginally unique pattern.