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.
$3$
$2$
$4$
$1$
Which of the following habitats is most unsuitable for primary productivity
Secondary producers are
If a predator overexploits its prey in an ecosystem then what might be consequences of this?
If all the plants of the world die all the animals will also die due to shortage of
Nektons are