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Question 3 • CMS 2026-2027 Biology CREDIT RECOVERY

Which is an important difference between light-dependent (L-D) and light-independent (L-IND) reactions in photosynthesis?

Answer

The L-D reactions can only occur during daylight, and the L-IND reactions can only occur during the night.

The L-D reactions need CO sub 2 and light energy, and the L-IND reactions needs water and cap o sub 2 .

The L-D reactions need water and CO sub 2 , and the L-IND reactions need CO sub 2 and light.

The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH, and CO sub 2 .

Explanation

The light-dependent reactions use light energy to split water, producing oxygen and storing energy in ATP and NADPH. The light-independent reactions (Calvin cycle) use ATP and NADPH to fix carbon dioxide into sugars. Thus, the correct choice is “The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH, and CO₂.”

AI-written and checked against the verified answer.

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