Choose correct sentence.
Choose correct sentence.
- A
Except for the deep sea hydro - thermal ecosystem, sun is the only source of energy for all ecosystems on earth of the incident solar radiation more than 50 percent of it is photo synthetically active radiation (PAR).
- B
Plant capture only $10-20$ percent of the PAR and this small amount of energy sustains the entire living world.
- C
All organisms are dependent for their food on producers.
- D
Primary producers in an aquatic ecosystem are zooplanktons.
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Choose the correct option for $\mathrm{A}$ and $\mathrm{B}$
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