The greatest biomass of autotrophs in the world's oceans is that of:
Correct answer: C. Free-floating microalgae, cyanobacteria and nanoplankton
- A. Benthic brown algae, coastal red algae and daphnids
- B. Benthic diatoms and marine viruses
- C. Free-floating microalgae, cyanobacteria and nanoplankton
- D. Sea-grasses and slime-molds
Explanation
Most oceanic autotrophic biomass is made up of microscopic, free-floating organisms, especially phytoplankton such as microalgae, cyanobacteria and nanoplankton. Large benthic algae and seagrasses are important locally but do not dominate the oceans globally.
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