MCQ
Pick up the correct food chain:
- AGrass → Chaemeleon → Insect → Bird.
- BGrass → Fox → Rabbit → Bird.
- CPhytoplankton → Zooplankton → Fish.
- DFallen leaves → Bacteria → Insect larvae.
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$(1)$ 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.

$R$ - The lower the $BOD$ of water, lower is its polluting potentials.