Factors Affecting Photosynthesis

• What does the rate of photosynthesis measure?

  How much photosynthesis occurs over time
• How is the rate of photosynthesis calculated?

  Using the formula: rate =
• What does the variable 'I' represent in the rate formula?

  Time for the measurement to occur
• What are the common units for measuring the rate of photosynthesis?

  • s⁻¹ (per second)
  • min⁻¹ (per minute)
  • h⁻¹ (per hour)
• What factor affects the rate of photosynthesis in this graph

  A) light intensity

  B) light intensity

  
• What factor affects the rate of photosynthesis in this graph?

  A) carbon dioxide

  B) carbon dioxide

  
• What factor affects the rate of photosynthesis in this graph?

  A) temperature

  B) temperature

  
• What factors affect the rate of photosynthesis?

  Light intensity, carbon dioxide, and temperature
• What are limiting factors in photosynthesis?

  Factors that restrict the rate of photosynthesis
• How does low light or carbon dioxide affect photosynthesis?

  It limits the rate of photosynthesis
• What happens if the temperature is too low for photosynthesis?

  The rate of photosynthesis is limited
• How can you measure the rate of photosynthesis?

  By measuring oxygen or glucose production
• Why is glucose important in measuring photosynthesis?

  It is used to produce new cells
• How can you calculate the rate of photosynthesis using biomass?

  By calculating the increase in biomass over time
• What are the key methods to measure photosynthesis rates?

  • Measure oxygen production
  • Measure glucose production
  • Calculate increase in biomass over time
• How does light intensity affect the rate of photosynthesis?

  Higher light intensity increases the rate of photosynthesis
• What happens to the rate of photosynthesis at maximum light intensity?

  It reaches its maximum rate
• What occurs to photosynthesis in very low light levels?

  Photosynthesis stops
• What is one of the reactants for photosynthesis?

  Carbon dioxide
• How does carbon dioxide concentration affect the rate of photosynthesis?

  Greater concentration increases the rate of reaction
• What percentage of carbon dioxide is found in the atmosphere?

  About 0.04%
• Why is carbon dioxide considered a limiting factor in photosynthesis?

  Because it is commonly in low concentration
• How do farmers increase the rate of photosynthesis in greenhouses?

  By artificially increasing carbon dioxide levels
• How does temperature affect the rate of photosynthesis?

  Higher temperature speeds up enzyme-controlled reactions
• What happens to the reactions if the temperature is too high?

  The reactions will stop