Nostoc and Anabaena can fix atmospheric nitrogen. They do this in their specialized cells called

Options :
  1. Idioblasts
  2. Lithocysts
  3. Cystoliths
  4. Heterocysts
Answer and Explanation :-

Answer: Option 4

Explanation:

Heterocysts are larger in size than other vegetative cells of the Nostoc and Anabaena filaments. They can be intercalary or terminal in position

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