32
QuizMultiple Choice

Photosynthesis in Plants

Question 32 • TX-Environmental Systems B

Which of the following statements about the dark reactions is true?

Answer
A
Dark reactions occur in the thylakoids of chloroplasts.
B
Light energy is converted to chemical energy during the dark reactions.
C
Carbon dioxide is converted to sugar using ATP and NADPH during the dark reactions.
D
All of the above

Explanation

The dark reactions, also called the Calvin cycle, use ATP and NADPH made during the light-dependent reactions to convert carbon dioxide into sugar. They occur in the chloroplast stroma, not the thylakoids, and do not directly convert light energy into chemical energy, so “Carbon dioxide is converted to sugar using ATP and NADPH” is the true statement.

AI-written and checked against the verified answer.

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