Question

1. the calvin cycle occurs in which part of the chloroplast?

a. thylakoid
b. stroma
c. granum
d. cristae

Explanation:

To determine where the Calvin cycle occurs in the chloroplast, we analyze each option:

• Option a: Thylakoids are involved in the light - dependent reactions of photosynthesis, not the Calvin cycle (which is light - independent).
• Option b: The stroma is the fluid - filled space within the chloroplast surrounding the thylakoid membranes. The Calvin cycle, which is the light - independent stage of photosynthesis that fixes carbon dioxide into organic compounds, takes place in the stroma.
• Option c: A granum is a stack of thylakoids. As thylakoids are for light - dependent reactions, grana are not the site of the Calvin cycle.
• Option d: Cristae are structures found in mitochondria (involved in cellular respiration), not in chloroplasts, so this option is irrelevant.

Answer:

b. stroma