Observe the given chart and identify what it represents.

Identify $Z$ in the given figure representing the carbon cycle.

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?

$A$: 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.

What is the approximate amount of carbon fixed in the biosphere annually through photosynthesis?

Match Column-$I$ with Column-$II$. Select the option with the correct combination.

$1$. Standing state	$p$. Mass of living material at a given time
$2$. Pioneer species	$q$. Amount of nutrients in the soil at a given time
$3$. Detritivores	$r$. Species that invade a bare area
$4$. Standing crop	$s$. Breakdown detritus into smaller particles