Question

which of the following statements about the dark reactions is true?
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:

• Option a: Dark reactions occur in the stroma of chloroplasts, not thylakoids. Thylakoids are for light - dependent reactions.
• Option b: Light energy is converted to chemical energy (ATP and NADPH) during light reactions, not dark reactions.
• Option c: In the dark reactions (Calvin cycle), carbon dioxide is fixed and using ATP and NADPH (from light reactions), it is converted to sugar (glucose).

Answer:

C. Carbon dioxide is converted to sugar using ATP and NADPH during the dark reactions.