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Photosynthesis questions:
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6 (a) The rate of photosynthesis is determined mainly by environmental limiting factors. These are light intensity, the availability of carbon dioxide and temperature. Water supply has indirect effects by influencing the availability of carbon dioxide.
(i) Define the term limiting factor.
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(ii) Explain how water shortage could have an indirect effect on photosynthesis by influencing the availability of carbon dioxide.
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(b) Some plants, such as wood sorrel, Oxalis acetosella, nearly always grow in shade where light intensity is commonly a limiting factor for photosynthesis. They are known as shade plants. Plants that live in open habitats, for example the daisy, Bellis perennis, are called sun plants.
Fig. 6.1 shows the net rate of photosynthesis of sun and shade plants in response to increasing light intensity. The net rate of photosynthesis is defined as:
mass of CO2 fixed in photosynthesis minus mass of CO2 produced in respiration, per unit time
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Jan’11:
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