A: Holophytic protistans are important phytop | vedclass

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(C) The Assertion is correct because holophytic protistans (like diatoms and dinoflagellates) are major producers in aquatic ecosystems,contributing s

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Assertion is correct,but Reason is incorrect.

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(C) The Assertion is correct because holophytic protistans (like diatoms and dinoflagellates) are major producers in aquatic ecosystems,contributing significantly to global photosynthesis. The Reason is incorrect because holophytic protistans are photoautotrophs that use $H_{2}O$ as the source of electrons and protons during photosynthesis,not non-sulphur organic compounds. Chemosynthetic organisms use inorganic chemical energy,which is not the primary mode of nutrition for these protists.

$A$: Holophytic protistans are important phytoplanktons and they contribute $80\%$ of the total photosynthesis.
$R$: They lack chemosynthetic nutrition and utilize non-sulphur organic compounds as the source of electron and proton in carbon assimilation.

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$A$: Holophytic protistans are important phytoplanktons and they contribute $80\%$ of the total photosynthesis. $R$: They lack chemosynthetic nutrition and utilize non-sulphur organic compounds as the source of electron and proton in carbon assimilation.