nutrition in plants
DESCRIPTION
For IGCSE O-Level Biology students Chapter 6TRANSCRIPT
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Nutrition in plants
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Plants are autotrophic organisms. They can make their own food using small
inorganic molecules and light energy. This process is called photosynthesis. Word equation:
Carbon dioxide+water glucose+oxygenLight
chlorophyll
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Leaf structure
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Leaf structure
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Fate of glucose
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Test for starch in leaves
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Finding out what is important for photosynthesis
How would you test for the importance of light ?
How would you test for the importance of CO2?
how would you test for the importance of chlorophyll?
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Hint: Soda lime absorbs CO2 in air.
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Hint:Variegated leaves have yellow areas with no chloroplasts.
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Measuring the rate of photosynthesis
How could you test the effect of:
Variable light intensities?
Variable CO2 concentrations?
Variable temperatures?
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Minerals needed by plants Nitrates: provide the plant with the
nitrogen needed to make amino acids and thus proteins.
Magnesium: is needed to make chlorophyll.
Predict how soil with no nitrates /magnesium would affect plant growth.
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Eutrophication
O2 level falls