B4

• Photosynthesis


  Process of converting water, carbon dioxide and light energy into oxygen and glucose
• Photosynthesis


  1. Water (H2O)

  2. Carbon dioxide (CO2)

  3. Oxygen (O2)

  4. Glucose (C6H12O6)
• The photosynthesis equation needs to be balanced, with 6 of each reactant and product
• Photosynthesis


  • Requires chlorophyll (green pigment in leaves)
  • Requires water and carbon dioxide as reactants
  • Requires sunlight as an energy source
• As the percentage level of carbon dioxide increases

  The rate of photosynthesis increases (up to a point)
• As light intensity increases

  The rate of photosynthesis increases (until other factors become limiting)
• As temperature increases


  The rate of photosynthesis increases (until enzymes become denatured)
• The rate of photosynthesis depends on multiple factors, not just one
• Glucose from photosynthesis


  Stored as starch, e.g. in potatoes
• Respiration


  1. Glucose (C6H12O6)

  2. Oxygen (O2)

  3. Water (H2O)

  4. Carbon dioxide (CO2)
• Respiration is an exothermic reaction, releasing energy
• Anaerobic respiration


  Respiration without oxygen, producing lactic acid and less energy
• Anaerobic respiration


  • In yeast, producing ethanol and carbon dioxide
• Metabolism


  The rate of chemical reactions in the body, involving energy from respiration
• Metabolism involves processes like converting glucose to starch, lipids or proteins