factors that affect photosynthesis

• chlorophyll absorbs light energy for photosynthesis
• plants may produce insufficient chlorophyll because:

  • They lack the required nutrients 
  • They have a disease like Tobacco Mosaic Virus
• three environmental factors that affect the rate of photosynthesis:

  • carbon dioxide concentration
  • light intensity
  • temperature
• the question mark could be:

  • light intensity
  • concentration of carbon dioxide

  
• this question mark can only be:

  • temperature

  
• we say that the red part has plateaued

  
• The limited factor could be:

  • concentration of carbon dioxide
  • temperature

  
• Farmers in cooler climates often use greenhouses. These help trap the heat energy from sunlight, and so increase the temperature. They also keep out pests which could otherwise damage the plants
• How can farmers ensure that photosynthesis takes place 24 hours a day?

  • Use artificial lighting