Factors that affect Photosynthesis

• What do plants need to carry out photosynthesis?

  Light, carbon dioxide, temperature, chlorophyll
• How does chlorophyll affect photosynthesis?

  Less chlorophyll means less photosynthesis
• What can cause variations in chlorophyll levels in plants?

  Disease, environmental stress, lack of nutrients
• What are the main limiting factors for photosynthesis?

  Light, carbon dioxide, temperature
• What does the x-axis represent in photosynthesis graphs?

  Light, carbon dioxide, and temperature
• What happens to the rate of photosynthesis as light intensity increases?

  It increases until it plateaus
• What does it mean when the graph of photosynthesis plateaus?

  Another factor is limiting photosynthesis
• How does carbon dioxide concentration affect photosynthesis?

  More carbon dioxide increases the rate
• What happens to the rate of photosynthesis as temperature increases?

  It rises then drops due to enzyme denaturation
• At what temperature are enzymes in photosynthesis fully denatured?

  About 45°C
• How can two different experiments be compared on a graph?

  By showing different curves for conditions
• What does a graph with two curves at different temperatures indicate?

  Temperature was the limiting factor
• What does a graph with higher carbon dioxide concentration show?

  It indicates carbon dioxide is limiting
• How do farmers create optimal conditions for photosynthesis?

  • Use greenhouses to trap heat
  • Provide artificial light
  • Pump carbon dioxide into greenhouses
  • Use paraffin heaters for heat and CO2
  • Apply fertilizers for essential minerals
  • Use pesticides to control pests
• What must farmers consider when increasing crop yield?

  Cost versus extra yield from crops
• Where can students find additional study resources?

  • Cognito.org for videos and questions
  • Flashcards and exam style questions
  • Progress tracking for study management