Question

Maximum biomass of autotrophs in oceans is made up of

• A. Benthic brown algae, coastal red algae and daphnids
• B. Benthic diatoms and marine viruses
• C. Sea grasses and slime moulds
• D. Free floating microalgae, cyanobacteria and nanoplankton

Answer 1

The correct option is D Free floating microalgae, cyanobacteria and nanoplankton

Biomass of an ecosystem is the total mass of organisms at each trophic level. The pyramid of biomass represents the biomass of individuals at each trophic level. Pyramid of biomass of ocean ecosystem is upright. The maximum biomass is present at the first trophic level. The first trophic level consists of producers such as free floating microalgae, cyanobacteria and nanoplankton.

Thus, the correct answer is 'Free floating microalgae, cyanobacteria and nanoplankton.'