Question

all of the following statements are correct about photosynthesis except: a photosynthesis occurs in the chloroplasts of the leaf. b the calvin cycle occurs in the thylakoid membrane. c the thylakoid membranes are part of the grana. d water provides hydrogen ions for photosynthesis.

Explanation:

• Option a: Chloroplasts in leaf cells are the sites of photosynthesis. This is correct.
• Option b: The Calvin cycle occurs in the stroma of the chloroplast, not in the thylakoid membrane. The light - dependent reactions occur in the thylakoid membrane. So this statement is incorrect.
• Option c: Thylakoid membranes are stacked to form grana. This is correct.
• Option d: In the light - dependent reactions, water is split (\(2H_2O

ightarrow4H^{+}+O_2 + 4e^{-}\)), and hydrogen ions (\(H^{+}\)) are provided for the synthesis of NADPH (in non - cyclic photophosphorylation) and for creating a proton gradient (for ATP synthesis). This is correct.

Answer:

B. The Calvin cycle occurs in the thylakoid membrane.