Algae: Classification and Characteristics · NCERT Biology

A unicellular alga rich in proteins and used as a food supplement by space travelers is:

  1. Chlorella
  2. Sargassum
  3. Gelidium
  4. Ulothrix
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Correct answer: Chlorella

Chlorella is a unicellular green alga that is exceptionally high in protein. It is widely used as a nutritional supplement and has been studied for use in space missions.

Difficulty: Medium Question 15 of 20

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