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 a plant to have less chlorophyll?

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

  Light, carbon dioxide, temperature
• What does a plateau in a photosynthesis graph indicate?

  Another factor is limiting photosynthesis
• How does light intensity affect the rate of photosynthesis?

  Higher light intensity increases the rate
• What happens to the rate of photosynthesis when carbon dioxide is plentiful?

  Another factor becomes limiting
• How does temperature initially affect the rate of photosynthesis?

  It increases the rate due to faster enzyme activity
• What happens to enzymes at high temperatures during photosynthesis?

  They begin to denature and stop working
• What does a graph with two curves indicate in photosynthesis experiments?

  Different limiting factors in each experiment
• How might farmers create optimal conditions for photosynthesis?

  Using greenhouses, artificial light, and CO2
• What is one benefit of using greenhouses for crops?

  They trap heat and protect from pests
• What must farmers consider when increasing crop yield?

  The cost versus the extra yield gained
• Where can students find additional study resources?

  On the website cognito.org
• What types of resources are available on cognito.org?

  Videos, questions, flashcards, exam papers
• What is the effect of a paraffin heater in greenhouses?

  It releases heat and carbon dioxide
• Why do farmers use fertilizers?

  To ensure plants have essential minerals
• What is the maximum temperature at which enzymes are fully denatured?

  About 45°C
• What happens to the rate of photosynthesis at temperatures above 45°C?

  The rate falls to zero
• What is the role of chloroplasts in photosynthesis?

  They contain chlorophyll for light absorption
• What is photosynthesis?

  The process by which plants convert light into energy
• How does chlorophyll relate to light absorption?

  Chlorophyll absorbs light energy for photosynthesis
• How does environmental stress affect chlorophyll production?

  It can reduce chlorophyll synthesis in plants
• Why are nutrients important for chlorophyll synthesis?

  They provide essential minerals for chlorophyll production
• What does a graph showing limiting factors illustrate?

  It shows how different factors affect photosynthesis
• What are the reactants in photosynthesis?

  Light, carbon dioxide, and water
• How does temperature affect enzyme activity in photosynthesis?

  Higher temperatures increase enzyme activity initially
• Why is it important to compare experimental conditions in photosynthesis studies?

  To identify which factor is limiting the rate
• What economic considerations do farmers face in crop production?

  Balancing costs against expected crop yield