Question:
Identify the mismatched pair
Identify the mismatched pair
Show Hint
{Stroma Lamellae} = Only PS I = Cyclic Photophosphorylation = No NADPH formed (No NADP reductase).
Updated On: Jun 9, 2026
- NADP reductase enzyme $\rightarrow$ Stroma lamellae
- PEP case $\rightarrow$ Mesophyll cell
- RuBisCO $\rightarrow$ Bundle sheath cell
- ATP synthetase enzyme $\rightarrow$ Chloroplast
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The Correct Option is A
Solution and Explanation
Step 1: Analyze Enzyme Locations:
Step 2: Conclusion:
Option (A) is the mismatched pair because the enzyme is absent in stroma lamellae.
- (A) NADP reductase: This enzyme is located on the stroma side of the thylakoid membrane. However, it is associated with Photosystem I (PS I). According to standard texts (e.g., NCERT), stroma lamellae membranes lack PS II and NADP reductase. This is why only cyclic photophosphorylation occurs there. Thus, placing it in stroma lamellae is a mismatch.
- (B) PEPcase: Found in the cytosol of Mesophyll cells in C$_4$ plants. Correct.
- (C) RuBisCO: Found in the Bundle sheath cells of C$_4$ plants (and mesophyll of C$_3$). Correct.
- (D) ATP synthetase: Found in the thylakoid membrane of the Chloroplast. Correct.
Step 2: Conclusion:
Option (A) is the mismatched pair because the enzyme is absent in stroma lamellae.
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