Biology

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What Is Photosynthesis?

Photosynthesis is the process plants use to turn sunlight, water and carbon dioxide into food and oxygen. Here is how it works, step by step.

September 18, 2026

Frequently asked questions

Do plants photosynthesize at night?

No. The light-dependent reactions need light directly, and without their products (ATP and NADPH) the Calvin cycle also stops. At night plants only respire, breaking down stored sugars for energy.

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