2.
A stomata closes when:
(i) It needs carbon dioxide for photosynthesis.
(ii) It does not need carbon dioxide for
photosynthesis.
(iii) Water flows out of the guard cells.
(iv) Water flows into the guard cells.
The correct reason (s) in this process is/are:
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)