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B4: Quiz 3

B4: Quiz 3

1)

a) What are the three main factors that affect the rate of photosynthesis?

b) What is a limiting factor?

2) The graph below has light intensity on the

a) What are the three main factors that affect the rate of photosynthesis?

b) What is a limiting factor?

2) The graph below has light intensity on the

*x*axis and the rate of photosynthesis on the*y*axis. One of the curves is drawn for a temperature of 15°C and the other curve is drawn for a temperature of 30°C.a) For the 15°C curve, when does light intensity stop being a limiting factor? Give your answer in arbitrary units.

b) For the 30°C curve, when does light intensity stop being a limiting factor? Give your answer in arbitrary units.

c) For the 15°C curve, what is the limiting factor when the curve becomes flat? Explain your answer.

3) The graph below has light intensity on the

b) For the 30°C curve, when does light intensity stop being a limiting factor? Give your answer in arbitrary units.

c) For the 15°C curve, what is the limiting factor when the curve becomes flat? Explain your answer.

3) The graph below has light intensity on the

*x*axis and the rate of photosynthesis on the*y*axis. One of the curves is for a concentration of carbon dioxide of 0.2% and a temperature of 20°C (green line), and the other curve is for a concentration of carbon dioxide of 0.02% and a temperature of 20°C (blue line).The curve for a concentration of carbon dioxide of 0.02% and a temperature of 20°C becomes flat at around a light intensity of 10 arbitrary units; what is the limiting factor for these conditions when the curve becomes flat? Explain your answer.

4) The graph below has the concentration of carbon dioxide on the

4) The graph below has the concentration of carbon dioxide on the

*x*axis and the rate of photosynthesis on the*y*axis. The curves for a temperature of 20°C (green) and 30°C (blue) look exactly the same.The three factors that affect the rate of photosynthesis are light intensity, concentration of carbon dioxide and temperature. When both the 20°C and 30°C curves become flat, what must be the limiting factor? Explain why the other factors cannot be the limiting factor.