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During photosynthesis A - VCE - SSCE Biology - Question 12 - 2020 - Paper 1
Question 12
During photosynthesis A. ATP and NADH created in the light-independent stage are transported to the chloroplasts' thylakoid membrane. B. ADP and NADH are used in t... show full transcript
Worked Solution & Example Answer:During photosynthesis A - VCE - SSCE Biology - Question 12 - 2020 - Paper 1
Step 1
A. ATP and NADH created in the light-independent stage are transported to the chloroplasts' thylakoid membrane.
Answer
This statement is incorrect because ATP and NADH are produced primarily in the light-dependent reactions, not the light-independent reactions. The products are used in the Calvin cycle, which occurs in the stroma.
Step 2
B. ADP and NADH are used in the electron transport chain after being created in the light-dependent stage.
Answer
This statement is misleading. While ADP is part of the ATP synthesis process, NADH is primarily associated with cellular respiration, not photosynthesis. In photosynthesis, NADPH is produced in light-dependent reactions and is used for the Calvin cycle.
Step 3
C. ATP and NADPH are created in the grana of the chloroplasts and are used in the light-independent stage.
Answer
This statement is correct. ATP and NADPH are produced in the thylakoid membranes (specifically in the grana) during the light-dependent reactions and are then utilized in the light-independent reactions (Calvin cycle) to synthesize glucose.
Step 4
D. ADP and NADPH are created during the Krebs cycle and carried to the stroma of the chloroplasts.
Answer
This statement is incorrect. The Krebs cycle occurs in mitochondria and is part of cellular respiration, not photosynthesis. NADPH is generated during the light reactions of photosynthesis, not the Krebs cycle.