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Explain the light-dependent reactions.
The light-dependent reactions occur in the thylakoid membranes. Light energy excites electrons in photosystem II. Water is split, releasing O2 and H+. Electrons move along the electron transport chain, driving ATP synthesis and reducing NADP+ to NADPH.
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Why do C4 plants have a higher photosynthetic rate in hot conditions?
C4 plants minimise photorespiration by concentrating CO2 in bundle sheath cells. This keeps RuBisCO working efficiently, even when stomata close.
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Why does the rate stop increasing at high light intensity?

Another factor, like carbon dioxide concentration or temperature, becomes limiting, so extra light no longer increases photosynthesis.
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What happens when light is no longer the limiting factor?

The rate plateaus because another factor limits photosynthesis.
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Explain why stomata close in hot, dry conditions.

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HSC Biology
Module 1 Cells80%
Module 2 Organisation65%
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