Limiting factors

• What should you be able to do by the end of the 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 when 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 if the temperature is increased too much?

  Enzymes in the leaf start to denature
• 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
  • Increase carbon dioxide concentration
  • Enhance crop yield
• Why do farmers use greenhouses?

  To increase the yield of crops
• What is a challenge of using greenhouses for increasing photosynthesis?

  It can be expensive to maintain
• What do some gardeners use to release heat and carbon dioxide?

  Oil burners
• Where can you find more questions on limiting factors?

  In the vision workbook
• What are the steps to determine the limiting factor in photosynthesis?

  1. Measure light intensity and photosynthesis rate
  2. Adjust carbon dioxide concentration
  3. Change temperature
  4. Observe changes in photosynthesis rate
• What role does chlorophyll play in photosynthesis?

  It absorbs light energy
• Why is light energy important in photosynthesis?

  It powers the reaction to produce glucose
• How does temperature affect enzyme activity in photosynthesis?

  Higher temperatures can increase activity until denaturation
• What is denaturation in enzymes?

  Loss of enzyme structure and function
• Why must the extra cost of greenhouse maintenance be justified?

  To ensure increased crop yield offsets costs
• How do environmental factors impact crop yield?

  They can enhance or limit growth potential