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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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Exam-style question

The graph shows the effect of light intensity on the rate of photosynthesis in a leaf.

a) Describe the trend shown. (2 marks)

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The rate increases as light intensity increases and then plateaus.
FeedbackGood start. To earn full marks, explain the limiting factor at high light and reference saturation.
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Improved answer

The rate of photosynthesis increases as light intensity increases because more photons drive the light-dependent reactions. The rate then levels off as another factor becomes limiting.
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Why do C4 plants have a higher photosynthetic rate in hot conditions?

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Exam-style Practice

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By topicPast-style
Cell structure12 questions75%
Photosynthesis18 questions75%
Genetics15 questions40%
Ecology16 questions0%
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Overall mark

7 / 10
Knowledge & understanding2 / 3
Application2 / 3
Analysis & evaluation2 / 2
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Explain why stomata close in hot, dry conditions.

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MTWTFSS12131415161718
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Genetics questions
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Past paper: Section II
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HSC Biology
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Module 2 Organisation65%
Module 3 Infection & Immunity40%
Module 4 Bioenergetics75%
Module 5 Heredity60%
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