Factors Influencing Photosynthesis Rate

Which of the following factors does NOT directly affect the rate of photosynthesis in plants?

• Light intensity

• Soil pH

• Temperature

• Carbon dioxide concentration

How does increasing light intensity generally affect the rate of photosynthesis, assuming other factors are not limiting?

• The rate decreases

• The rate remains unchanged

• The rate increases up to a certain point

• The rate drops to zero

What is the effect of water stress (lack of water) on the rate of photosynthesis?

• It increases the rate

• It has no effect

• It decreases the rate

• It causes the rate to fluctuate randomly

At what temperature range do most Australian native plants carry out photosynthesis most efficiently?

• 0–5°C

• 10–25°C

• 35–50°C

• 60–75°C

Which gas is a raw material required for photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Methane

What is the main product of photosynthesis?

• Glucose

• Oxygen

• Carbon dioxide

• Water

Which of the following best describes the relationship between carbon dioxide concentration and the rate of photosynthesis?

Which of the following is a common method for measuring the rate of photosynthesis in a laboratory setting?

• Measuring the amount of water absorbed by roots

• Counting the number of leaves

• Measuring the volume of oxygen produced

• Weighing the plant

If a plant is exposed to very high temperatures, what is the likely effect on the rate of photosynthesis?

• The rate will increase indefinitely

• The rate will decrease due to enzyme denaturation

• The rate will remain constant

• The rate will double

Which of the following equations correctly represents photosynthesis?