NEETBotanyPhotosynthesis in Higher Plants
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During photosynthesis, ATP and NADPH produced in the light reaction diffuse out of the chloroplast to provide energy for various cellular processes. Reason (R): ATP and NADPH are required to drive the biosynthetic phase occurring in the stroma of the chloroplast. In the light of the above statement
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
D. (A) is false but (R) is true
Step-by-step solution
Assertion (A) is false because ATP and NADPH produced during the light reaction do not diffuse out of the chloroplast to power general cellular processes. Oxygen is the only product of the light reaction that diffuses out of the chloroplast into the surrounding environment. Reason (R) is true because the assimilatory powers (ATP and NADPH) are strictly retained within the chloroplast and utilized to drive the biosynthetic phase (Calvin cycle) for CO ₂ fixation, which takes place in the stroma. Answer: (A) is false