Question

level 5
q2
what stage of photosynthesis uses
carbon dioxide to make glucose?
a. light reactions
b. calvin cycle
c. atp synthesis
d. cellular respiration
a light reactions
b calvin cycle
c atp synthesis
d cellular respiration

Explanation:

• Option A: Light reactions in photosynthesis convert light energy to chemical energy (ATP, NADPH) and split water, not use CO₂ to make glucose.
• Option B: The Calvin Cycle (light - independent reactions) uses carbon dioxide, along with ATP and NADPH from light reactions, to synthesize glucose (or other carbohydrates).
• Option C: ATP synthesis is part of the light reactions (and also in cellular respiration), it's about producing ATP, not using CO₂ to make glucose.
• Option D: Cellular respiration is the process of breaking down glucose to release energy, opposite of using CO₂ to make glucose.

Answer:

B. Calvin Cycle