Question
Biology Question on Photosynthesis in higher plants
NADP+ is reduced to NADPH in
A
PS 1
B
PS II
C
Calvin cycle
D
noncyclic photophosphorylation.
Answer
noncyclic photophosphorylation.
Explanation
Solution
Non-cyclic photophosphorylation involves both PS-1 and PS-11. Here electrons are not cycled back and are used in the reduction of NADP to NADPH,. Here water is utilized and O, evolution occurs. One molecule of ATP is produced between plastoquinone and cytochrome f. Whereas in cyclic photophosphorylation only PS-I is involved. Here electrons from P-700 are recycled back to P-700. Water is not utilized here and O, evolution does not occur. It involves production of two ATP molecules, no NADPH, is produced. Thus ATP synthesis occurs in both PS-I and PS-II.