Unit 3: Interaction and Interdependence
Topic 3.3: Photosynthesis Questions
Practice 20 exam-style questions for IB Biology Topic 3.3. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State1 mark
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State the energy conversion that takes place during photosynthesis.
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What lets carbon dioxide enter the leaf so it can reach the chloroplasts?
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On a graph of photosynthesis rate against light intensity, the curve rises steeply at low light intensity.
Which factor is limiting the rate on this rising part of the curve?
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Which biological molecule is built FIRST from the carbon a plant has just fixed, before any other is made?
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On a leaf transverse (cross) section, which description identifies the palisade mesophyll?
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Which process locks carbon from atmospheric carbon dioxide into a biological molecule inside a plant?
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State the two products of photosynthesis.
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State the three environmental factors that can act as limiting factors for the rate of photosynthesis.
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State the two colours (regions) of visible light that chlorophyll absorbs most strongly.
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Which statement best describes what a 'limiting factor' for photosynthesis is?
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Why does a healthy green leaf appear green to the human eye?
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In terms of energy, photosynthesis is best described as a process that:
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Which layer of a leaf carries out most of the photosynthesis?
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Outline why the rate of photosynthesis increases as light intensity is raised on the steep, rising part of a rate-vs-light-intensity curve.
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Which two regions of the visible spectrum does chlorophyll absorb most strongly?
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An aquatic plant in bright light gives off a steady stream of gas bubbles from its cut stem.
What is the gas, and what does counting the bubbles tell you?
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Which two changes to the gases happen during photosynthesis?
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Which row correctly gives the raw materials and the products of photosynthesis?
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State the name of the molecule a plant builds first from the carbon it fixes in photosynthesis.
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State which tissue in a leaf carries out most of the photosynthesis.
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