Maximum biomass and variable organisms are found in

$A$: Neither the community modifies the environment nor the environment forces the community to leave the place in the climax stage of succession.
$R$: Climax community is xerophytic in most of the types of succession.

Which one statement is correct regarding man-made ecosystems?

Select the correct option for the following processes:
$P$ - Formation of organic components from inorganic components
$Q$ - Formation of inorganic components from organic components
Select the correct option for $P$ and $Q$.

Which is the primary colonizer in primary succession on rock?

According to $David \ Tilman$,greater the diversity,greater is the primary productivity. Can you think of a very low diversity man-made ecosystem that has high productivity?