Nutrition in plants
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
Leaf structure
Leaf structure
Fate of glucose
Test for starch in leaves
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?
Hint: Soda lime absorbs CO2 in air.
Hint:Variegated leaves have yellow areas with no chloroplasts.
Measuring the rate of photosynthesis
How could you test the effect of:
Variable light intensities?
Variable CO2 concentrations?
Variable temperatures?
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.
Eutrophication
O2 level falls