Photosynthesis

• What is the process by which plants make their own food?

  Photosynthesis
• What do plants use to make glucose during photosynthesis?

  Energy from sunlight or an artificial source
• What is the role of glucose in plants?

  It is used to make larger, complex molecules needed for growth
• How does the biomass of plants relate to the food chain?

  The biomass is stored and works its way through the food chain
• What do chloroplasts contain that is essential for photosynthesis?

  Chlorophyll, which absorbs light
• What is the equation for photosynthesis?

  Carbon dioxide + water + light energy → glucose + oxygen
• What type of reaction is photosynthesis?

  It is an endothermic reaction
• What happens to water during photosynthesis?

  It is split into oxygen and hydrogen ions
• What combines with hydrogen ions to make glucose during photosynthesis?

  Carbon dioxide
• What does it mean when a factor becomes a limiting factor in photosynthesis?

  It stops photosynthesis from happening any faster
• How can you investigate the effect of different factors on the rate of photosynthesis?

  By using pondweed and measuring oxygen production
• What does the rate of oxygen production in pondweed indicate?

  It corresponds to the rate of photosynthesis
• What is the basic method for measuring the rate of photosynthesis using pondweed?

  1. Set up the experiment with pondweed in water.
  2. Allow it to photosynthesize for a set time.
  3. Measure the length of the gas bubble produced in the capillary tube.
  4. Repeat the experiment to test different factors.
  5. Keep other variables constant.
• What is a less accurate method to measure oxygen production in pondweed?

  Counting the bubbles produced