Question

The greatest biomass of autotrophs in the world's oceans is that of

(a) benthic brown algae, coastal red algae and dephnids 

(b) benthic diatoms and marine viruses 

(c) sea grasses and slime molds 

(d) free-floating micro-algae, cyanobaceria and nanoplankton

Answer 1

Correct option (d) free-floating micro-algae, cyanobaceria and nanoplankton

Explanation:

The greatest biomass of autotrophs in the world's ocean is that of free floating micro-algae, cyanobacteria and nanoplankton. Phytoplanktons, diatoms and dinoflagellates are the dominant producers in the world's oceans.