Factors of Photosynthesis

• What are the three main factors that affect the rate of photosynthesis?

  Light intensity, carbon dioxide concentration and temperature
• Why do plants grow quickly in summer but hardly in winter?

  They need light, warmth, and carbon dioxide
• What are the three limiting factors of photosynthesis?

  • Carbon dioxide concentration
  • Temperature
  • Light intensity
• How does light intensity affect photosynthesis?

  Higher light intensity increases the rate of photosynthesis
• What happens to photosynthesis when light intensity is very low?

  Photosynthesis will stop despite other conditions
• What is the maximum point in relation to light intensity?

  It is where no more light increases photosynthesis
• How does carbon dioxide concentration affect photosynthesis?

  Increasing carbon dioxide boosts the rate of photosynthesis
• When is carbon dioxide concentration a limiting factor?

  On sunny days when light is abundant
• Why do carbon dioxide levels rise at night?

  Plants respire but do not photosynthesize
• How does temperature affect photosynthesis?

  Temperature affects enzyme activity in photosynthesis
• What happens to the rate of photosynthesis as temperature rises?

  The rate of photosynthesis increases until enzymes denature
• What is the effect of temperatures above 40-50°C on photosynthesis?

  Enzymes denature, stopping photosynthesis
• What happens to photosynthesis at low temperatures?

  The rate of photosynthesis decreases due to less energy
• A is pointing at the point where, temperature is increasing which increases the amount of kinetic energy which increases the rate of photosynthesis. At this point temperature is the limiting factor.


  In this diagram describe what A is point at.

  
• B is pointing at the point where, temperature is at its optimum level, At this point temperature is no longer the limiting factor.


  In this diagram describe what B is pointing at.

  
• C is pointing at the point where, the temperature has risen to around 40-50 degrees Celsius meaning the enzymes denatured which control photosynthesis. At this point temperature becomes the limiting factor again.


  In this diagram describe what C is pointing at.

  
• D - Rate of Photosynthesis

  E - Temperature 


  Label D and E