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Which of the following organisms are known as chief producers in the oceans?

1. Dinoflagellates
2. Diatoms
3. Euglenoids
4. Cyanobacteria

Correct answer: Diatoms

Solution

Diatoms are major phytoplankton in the oceans and are among the chief primary producers there. Their high photosynthetic productivity makes them a key foundation of marine food webs.

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