nutrition in plants
DESCRIPTION
For IGCSE O-Level Biology students Chapter 6TRANSCRIPT
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