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📘 How a leaf turns light into sugar

Trace photons through chloroplasts, electron transport, carbon fixation, sugar, and gas exchange.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Chloroplast
Photons
Water splitting
ATP
NADPH
Carbon fixation
Sugar
Gas exchange
Limits
Respiration

Questions this course answers

Where does most photosynthesis occur?

Chloroplasts contain the pigments, membranes, and enzymes for photosynthesis.

What is the source of oxygen released by the light reactions?

Water is split to replace electrons, producing molecular oxygen.

What does ATP synthase use to make ATP?

Protons flowing through ATP synthase drive phosphorylation of ADP.

What does Rubisco do?

Rubisco begins the Calvin-cycle carbon-fixation reaction.

Why can drought lower photosynthesis?

Stomatal closure conserves water but reduces carbon dioxide diffusion into the leaf.

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