Limiting factors of photosynthesis

Which environmental factor directly affects the rate of photosynthesis by influencing the activity of enzymes involved in the process?

• Oxygen concentration

• Light intensity

• Carbon dioxide concentration

• Temperature

Why does the rate of photosynthesis increase with greater light intensity?

• More carbon dioxide is available

• Light dependent stage occurs faster

• Temperature decreases

• Less reduced NADP

What occurs when the rate of photosynthesis reaches a plateau with increasing light intensity?

• Light intensity becomes a limiting factor

• Other factors become limiting

• Photosynthesis stops

• Carbon dioxide concentration decreases

Why is carbon dioxide considered a crucial raw material for photosynthesis?

• It provides energy

• It is a by product

• It is required for light-dependent stage

• It is needed for light-independent stage

What role does carbon dioxide play in the light-independent stage (Calvin cycle) of photosynthesis?

• It combines with water

• It is releases as a waste product

• It is combined with RuBP

• It provides energy for ATP synthesis

Why does the rate of photosynthesis decrease beyond a certain temperature?

• Enzymes become more active

• Enzymes denature

• Light intensity decreases

• Carbon dioxide concentration increases

Which part of photosynthesis is specifically affected by temperature due to enzyme-controlled reactions?

• Calvin Cycle

• Light-dependent reaction

• Photophosphorylation

• Chlorophyll synthesis

What enzyme is mentioned in the context of the light-independent reactions and temperature?

• Amylase

• RuBP

• Ribulose bisphosphate carboxylase

• catalase

What does the increased light-dependent stage result in during photosynthesis?

• More oxygen production

• Greater ATP and reduced NADP production

• Slower Calvin Cycle

• Reduces carbon dioxide absorption

How does an increase in carbon dioxide concentration affect the Calvin cycle?

• It slows down the cycle

• It has no effect on the cycle

• It speeds up the cycle

• It disrupts the cycle