biology / Cells / free

Photosynthesis

Trace how light energy becomes stored chemical energy in a cell.

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Photons excite chlorophyll. Light energy is absorbed in photosystems embedded in thylakoid membranes. Water supplies replacement electrons, and oxygen leaves as a by-product of water splitting.

photosynthesisenergy building · balanced

Focus the idea

electron flow68%

proton gradient62%

sugar rate52%

oxygen release39.4%

Light intensity 72%Carbon dioxide 64%Water availability 78%Stomatal conductance 68%Photosynthesis time 72%

Light reactions use photons and water to build a 62% proton gradient, supplying ATP and NADPH while releasing 39.4% oxygen.

This is a normalized chloroplast model. Real photosynthesis includes photosystems I and II, electron carriers, ATP synthase, Rubisco, photorespiration, regulation, and tissue-level gas exchange.

04 / PRACTICE

Make the biology yours.

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Answer from the model, then use the explanation to connect the visual mechanism to the biological rule.

CHECK 1 / 3

Photosynthesis

Make the biology yours.

What is the main role of the light reactions?