Limiting Factors

• What should you be able to do by the end of this video?

  Interpret graphs and explain greenhouse use
• What is the equation for photosynthesis?

  Light energy + CO2 + water → glucose + oxygen
• What happens to the rate of photosynthesis as light intensity increases?

  It initially increases, then levels off
• What does it indicate when the rate of photosynthesis stops increasing with light intensity?

  Light intensity is no longer the limiting factor
• What are the three other factors that limit photosynthesis?

  Carbon dioxide concentration, temperature, chlorophyll
• How does increasing carbon dioxide concentration affect photosynthesis?

  It increases the rate of photosynthesis
• What happens when carbon dioxide concentration is increased beyond a certain point?

  The rate of photosynthesis does not change
• What effect does increasing temperature have on photosynthesis?

  It can increase the rate of photosynthesis
• What happens to enzymes in leaves if the temperature is too high?

  They start to denature, reducing photosynthesis
• What can act as limiting factors in photosynthesis?

  Light intensity, carbon dioxide, temperature, chlorophyll
• How do greenhouses increase the rate of photosynthesis?

  • Provide controlled light and heat
  • Add extra carbon dioxide
  • Increase crop yield
• Why is it expensive to maintain optimal conditions in greenhouses?

  Costs must be justified by increased yield
• What do some gardeners use to release heat and carbon dioxide?

  Oil burners
• What type of questions can be found in the vision workbook?

  Questions on limiting factors
• What should you be able to explain after this video?

  How greenhouses increase photosynthesis rate
• What role does chlorophyll play in photosynthesis?

  It absorbs light energy for photosynthesis
• How does temperature affect enzyme activity in photosynthesis?

  Higher temperatures can denature enzymes
• Why is it important to control conditions in a greenhouse?

  To maximize photosynthesis and crop yield