Flowering plants

• Factors affecting photosynthesis:

  1. Co2 concentration
  2. Light intensity
  3. Temperature
• Test for starch

  1. Place leaf in boiling water : to stop all chemical reactions
  2. Boil leaf in ethanol
  3. Using water bath
  4. Wear safety goggles
  5. Add iodine solution
• Test for light

  1. Take leaf from same plant
  2. Put black tape on one of the leaves
  3. Leave out in same light intensity + conditions
  4. Test for starch
• Test for Co2

  1. Put two leaves in bell jar
  2. Put potassium hydroxide in one belljar
  3. Leave for a day
  4. Test for starch
• Before all experiments.....


  Leave plant in dark room to stop photosynthesis/destarch plant
• Test for Chlorophyll

  1. Get a variegated leaf & normal leaf
  2. Tape green areas of variegated leaf with black tape
  3. Expose to the same conditions
  4. Test for starch
• Nitrate ions

  1. For amino acids
  2. For protiens
  3. For growth
  4. Lack of = yellowing of leaves + poor growth
• Magnesium ions 


  For production of cholorphyll/chloroplasts
• Potassium

  1. Production of enzymes for photosynthesis
  2. Lack of = poor growth, poor fruit, brown spots
• Seed germination

  1. Before germination seeds have food reserves (starch)
  2. When in contact with oxygen + water, starts germinating
  3. Food reserves convert to glucose for respiration
• Virus which effects plants

  1. Tabaco mosaic virus
  2. Discolours leaves, less photosynthesis
• How does style tissue help tube grow?

  1. Tissue provides glucose for respiration
  2. Supplies amino acids for growth
  3. Supplies water