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(A) Option $A$ is correct.$1$. Except for deep-sea hydrothermal ecosystems,the sun is the only source of energy for all ecosystems on Earth.$2$. Of th

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Except for the deep sea hydrothermal ecosystem,the sun is the only source of energy for all ecosystems on Earth; of the incident solar radiation,more than $50$ percent is photosynthetically active radiation $(PAR)$.

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(A) Option $A$ is correct.$1$. Except for deep-sea hydrothermal ecosystems,the sun is the only source of energy for all ecosystems on Earth.$2$. Of the incident solar radiation,less than $50$ percent is photosynthetically active radiation $(PAR)$.$3$. Plants capture only $2-10$ percent of the $PAR$,and this small amount of energy sustains the entire living world.$4$. All organisms are dependent on producers for their food,either directly or indirectly.$5$. Primary producers in an aquatic ecosystem are phytoplankton,algae,and higher plants,not zooplankton.

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