Limiting Factors of Photosynthesis

The graph below shows the rate of photosynthesis of a plant in an experiment. What is the limiting factor of photosynthesis at high light intensity?

• Light intensity

• carbon dioxide concentration

• temperature

The graph shows the rate of photosynthesis plotted against an unknown factor. What is the factor limiting the rate of photosynthesis as shown in the graph?

• carbon dioxide concentration

• light intensity

• number of chloroplasts

• temperature

The diagram below shows a photosynthesis investigation. The plant has leaves that are green in the middle and white round the edges. Which leaf areas lack only one factor needed for photosynthesis?

• 1 and 2

• 1 and 3

• 2 and 4

• 3 and 4

Which of the following equations represents the overall chemical reaction for photosynthesis?

• 6O₂+ 6H₂O → C₆H₁₂O₆+ 6O₂

• C₆H₁₂O₆ + 6H₂O→ 6O₂+ 6O₂

• 6CO₂+ 6H₂O→ C₆H₁₂O₆+ 6O₂

• 6O₂ + 6H₂O→ C₆H₁₂O₆ + 6CO₂

Which lettered graph represents the affect of light intensity on photosynthetic rate?

• A

• B

• C

• D

When it is chilly and raining outside, there is no photosynthesis taking place. What is the limiting factor?

• Temperature
• Rainfall
• Carbon Dioxide

Which of these will not affect photosynthesis?

• Light
• Temperature
• Glucose Availability
• Carbon Dioxide

If a plant receives more carbon dioxide, what happens to the rate of photosynthesis?

• Increases
• Decreases
• Stays the same

What is a limiting factor?

• The factor which increases the rate of a reaction
• The factor that limits the reaction rate
• The factor that limits the rate at which an enzyme is destroyed

Which lettered graph represents the effect of temperature on photosynthetic rate?

• A

• B

• C

• D