Y10 Limiting factors photosynthesis SYIU

The equation for photosynthesis involves the reaction of carbon dioxide and water to produce:

• Oxygen and glucose
• Oxygen and starch
• Carbon dioxide and glucose
• Carbon dioxide and starch

In the graph showing the relationship between light intensity and the rate of photosynthesis, what happens to the rate of photosynthesis as light intensity increases?

• It decreases
• It remains constant
• It increases initially and then levels off
• It increases continuously

What does the leveling off of the rate of photosynthesis in the light intensity graph indicate?

• Light intensity is the limiting factor
• Carbon dioxide concentration is the limiting factor
• Temperature is the limiting factor
• Temperature or carbon dioxide could be the limiting factor

In the graph showing the relationship between carbon dioxide concentration and the rate of photosynthesis, what happens to the rate of photosynthesis as carbon dioxide concentration increases?

• It decreases
• It remains constant
• It increases initially and then levels off
• It increases continuously

What does the leveling off of the rate of photosynthesis in the carbon dioxide concentration graph indicate?

• Light intensity is the limiting factor
• All are correct
• Temperature is the limiting factor
• Carbon dioxide is no longer the limiting factor

In the graph showing the relationship between temperature and the rate of photosynthesis, what happens to the rate of photosynthesis as temperature increases?

• It decreases
• It remains constant
• It increases initially and then decreases
• It increases continuously

What happens to the rate of photosynthesis if the temperature becomes too high?

• It increases even more
• It remains constant
• It decreases
• It stops completely

Which of the following factors can act as a limiting factor in photosynthesis?

• Light intensity
• Carbon dioxide concentration
• Temperature
• All of the above

What is the purpose of using a greenhouse in agriculture?

• To limit the amount of light reaching the plants
• To control the temperature for optimal photosynthesis
• To decrease the carbon dioxide concentration
• To reduce the amount of chlorophyll in the leaves

How do farmers increase the rate of photosynthesis in a greenhouse?

• By reducing the light intensity
• By decreasing the temperature
• By adding extra carbon dioxide
• By removing chlorophyll from the leaves