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): Stroma lamellae membranes lack the ability to evolve oxygen. Reason (R): Stroma lamellae lack the photosystem whose reaction centre has an absorption maximum at 680 nm. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation of Assertion (A).
- BAssertion (A) is correct but Reason (R) is not correct.
- CAssertion (A) is not correct but Reason (R) is correct.
- DBoth Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A).
Correct answer
D. Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A).
Step-by-step solution
Assertion (A) is correct because stroma lamellae membranes do not perform photolysis of water, hence they do not evolve oxygen. Reason (R) is correct because stroma lamellae lack Photosystem II (PS II). The reaction centre of PS II is P680, which has an absorption maximum at 680 nm. The splitting of water (which evolves oxygen) is physically and biochemically associated with the PS II complex. Since stroma lamellae lack PS II, they cannot split water and evolve oxygen. Thus, Reason (R) is the correct explanation fo