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a
Atleast one half of the total CO2, fixation on earth is carried out by algae through photosynthesis
b
Being photosynthetic they increase the level of dissolved oxygen in their immediate environment
c
They are of paramount importance as primary producers which form the basis of food cycles of all aquatic animals
d
All have flagellated gametes
answer is D.
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Detailed Solution
Some algae do not have flagellated gametes. Algae are useful to man in many ways. At least a half of total CO2 fixation on earth is carried by algae through photosynthesis.They also increase the dissolved O2 levels in immediate atmosphere.They are producers in aquatic food chain.