Benthic organisms are affected the most by

Given below is a figure of an ecosystem. Answer the following questions.
$(i)$ What type of ecosystem is shown in the figure?
$(ii)$ Name any plant that is characteristic of such an ecosystem.

Which one of the following systems constitutes the primary producers?

The entire sequence of communities that successfully change in a given area is called $P$. The individual transitional communities are termed as $Q$.

The area where succession can take several thousand years to reach a climax community is:

What is the amount of $PAR$ in incident solar radiation?