In a food chain of grassland ecosystem, the top consumers are

How many sentence are correct?

$(1)$ The trophic levels in $GFC$ are unlimited

$(2)$ Organisms at each trophic level depend on those at the higher trophic level for their energy demands.

$(3)$ Plants capture only $2 -10$ percent of $PAR$.

$(4)$ All organisms are dependent for their food on producers, either directly or indirectly.

The transfer or energy from organisms to organisms in a natural community establishes

$PAR$ stands for

Assertion : A network of food chains existing together in an ecosystem is known as food web.
Reason : An animal like kite cannot be a part of a food web.