8
QuizMultiple Choice

Meiosis — Unit test

Question 8 • HVA 26-27 IM Biology A

Which statement best distinguishes the light-dependent (L-D) reactions from the light-independent (L-IND) reactions?

Answer
A
The L-D reactions occur in the thylakoid membrane, and the L-IND reactions occur in the stroma.
B
The L-D reactions occur in the cytoplasm, and the L-IND reactions occur in the chloroplast.
C
The L-D reactions occur in the chloroplast, and the L-IND reactions occur in the mitochondria.
D
The L-D reactions occur in the stroma, and the L-IND reactions occur in the cytoplasm.

Explanation

The light-dependent reactions take place in the thylakoid membranes of chloroplasts, where light energy is captured to make ATP and NADPH. The light-independent reactions, also called the Calvin cycle, occur in the chloroplast stroma and use ATP and NADPH to build sugars. Therefore, the best distinction is that the reactions occur in the thylakoid membrane and stroma, respectively.

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