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3.1 Plants and Food

Photosynthesis

    • What kinds of experiments would you use to investigate photosynthesis; showing the production of starch and the requirements of light, carbon dioxide and chlorophyll?
    • What is photosynthesis?
    • Can you write the word equation and the balanced chemical symbol equation for photosynthesis?
    • How is the structure of a leaf adapted for gas exchange and photosynthesis?
    • How are gases exchanged through the stomata?
    • How are gases exchanged in flowering plants, in relation to respiration and photosynthesis?
    • Do you understand that respiration continues 24 hours a day, but that the net exchange of carbon dioxide and oxygen depends on the intensity of light?
    • How can you use hydrogencarbonate indicator to investigate the effect of light on net gas exchange from a leaf?
    • Can you sketch a graph and explain it, to show how carbon dioxide concentration, light intensity and temperature all affect the rate of photosynthesis?
    • Can you describe a simple controlled experiment to investigate photosynthesis, showing the evolution of oxygen from an aquatic plant?
    • What are magnesium ions and nitrates needed for in plant growth?

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Watch the photosynthesis song to learn how a plant grows!

Click here to see an animation explaining photosynthesis and showing the equation.

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Click here to try a virtual starch leaf test experiment.

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Click here to try a virtual experiment to investigate photosynthesis in an aquatic plant.

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Test your knowledge with Quizlet: IGCSE Biology – Plants and Food

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