Paper 1

• Photosynthesis


  1. Takes place in leaves

  2. Takes place in chloroplasts

  3. Chlorophyll absorbs light

  4. Converts carbon dioxide and water into glucose and oxygen
• How plant gets reactants for photosynthesis

  1. Carbon dioxide diffuses into leaves through stomata

  2. Water is taken up from soil by roots and transported to leaves via xylem
• Products of photosynthesis


  • Glucose is essential
  • Oxygen is also produced but not as important
• Uses of glucose


  • Cellular respiration
  • Making cellulose
  • Making starch
  • Making amino acids
  • Making oils and fats
• Plant growth rate often depends on rate of photosynthesis
• Factors affecting rate of photosynthesis are light intensity, temperature, carbon dioxide concentration, and amount of chlorophyll