Question

Which statements are true about heterocyst?
(a) Thick cell wall is permeable to oxygen
(b) It lacks PS-II
(c) PS-I remains active which generates ATP required to fix nitrogen.

• A. All except (a)
• B. All except (b)
• C. All except (c)
• D. All (a), (b) and (c)

Answer 1

Answer: (A)

All except (a)

1) heterocyst cells with thick cell films to prohibit oxygen.

2) heterocysts do not have a utilitarian photosystem II.

3) The settled carbon and nitrogen sources are traded through diverts between the cells in the fiber. Heterocysts keep up photosystem I, enabling them to create ATP by cyclic photophosphorylation as there is no release of $O_2$

So, the correct answer is 'All except (a)'