MCQ
The effect of oxygen supply on growth is
- ✓Positive
- BNegative
- CIn some plants it is positive while in others it is negative
- DNone of the above
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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.