Question

Nostoc is known to do

• A. Photosynthesis
• B. Photosynthesis and $N_2$ fixation simultaneously
• C. $N_2$ fixation only
• D. Either photosynthesis or $N_2$ fixation at a time

Answer 1

Answer: (B)

Photosynthesis and $N_2$ fixation simultaneously

Nostoc is a genus of blue green algae. It is photosynthetic cyanobacteria. It contains chlorophyll pigment and carries out photosynthesis. It also has ability to fix atmospheric nitrogen and make it available to the plants. It is a non-symbiotic nitrogen fixer.

Thus, the correct answer is 'Photosynthesis and N${}_2$ fixation simultaneously.'