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.

$A$ : Detritus food chain begins with detritus.

$R$ : Detrivores like fungi and bacteria are major decomposers in such food chains.

$...A...$ is required for higher primary productivity. $...B...$ have the lowest primary productivity as the soil is deficient in moisture.

Choose the correct option for $\mathrm{A}$ and $\mathrm{B}$

Abyssal zone of oceans is characterized by

Ecosystem creates

In an ecosystem, the insectivorous plants are placed in