Which groups are organisms divided into based on their primary ecological role?

What percentage of $PAR$ can be captured by plants?

Consider the following statements about the carbon cycle and choose how many statements are correct?
$(a)$ The atmosphere contains $71\;\%$ of the total global carbon.
$(b)$ Decomposers contribute substantially to the $CO_2$ pool by processing waste materials and dead organic matter from land or oceans.
$(c)$ $4 \times 10^{13}\; kg$ of carbon is fixed through photosynthesis annually.
$(d)$ There is no respiratory input into the atmosphere.
$(e)$ Carbon constitutes $49\;\%$ of the dry weight of organisms.

What is the primary ecological niche?

Identify $Y$ and $Z$ from the given figure representing the carbon cycle.

In a pond ecosystem,zooplankton can be placed at which trophic level?