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The greatest biomass of autotrophs in the oceans is that of

1. sea grasses and slime moulds
2. free floating microalgae, cyanobacteria and nanoplankton
3. benthic brown algae, coastal red algae and daphnids
4. benthic diatoms and marine viruses

Correct answer: free floating microalgae, cyanobacteria and nanoplankton

Solution

The greatest biomass of autotrophs in the oceans is contributed by free-floating microalgae, cyanobacteria, and nanoplankton, as they are primary producers and form the base of the marine food web.

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