Question

Study the following and choose the correct pair

• A. II
• B. I
• C. II, III
• D. I, III

Hint:

In cyclic electron transport, only PS I is involved, and NADPH is not formed. In contrast, in non-cyclic electron transport, both PS I and II are involved, and NADPH is generated.

Answer 1

The Correct Option is D

Analysis of the Pairs

Let's analyze the pairs:

• I. Hatch and Slack Cycle: In this cycle, NADPH + H⁺ and ATP are used in a 2:3 ratio for the fixation of carbon dioxide. The process involves decarboxylation.
  Hence, the feature for the Hatch and Slack cycle is correct: NADPH + H⁺ and ATP are used in a 2:3 ratio, Decarboxylation.
• II. Non-Cyclic e^- Transport: In this process, H₂O is the electron donor and involves both Photosystem I and II.
  The feature for non-cyclic electron transport is also correct: H₂O is the electron donor, but Only PS I involved is incorrect.
  This should be: Both PS I and II involved.
• III. Cyclic e^- Transport: In cyclic electron transport, H₂O is not a donor, and NADPH + H⁺ is not formed.
  This is correct, so the feature is accurate.

Thus, the correct pairs are I and III.

Therefore, the correct answer is (4) I, III.