Factors affecting photosynthesis - Emily

Question 1

what are the 3 factors that affect the rate of photosynthesis?

Answer 1

• light intensity
• temperature
• carbon dioxide concentration

Question 2

how does light intensity affect photosynthesis?

Answer 2

• if the light intensity is increased, there is an increase in the rate of photosynthesis, but only to a maximum level.l

Question 3

what happens to the plant if the light intensity is too high?

Answer 3

• the stomata close and carbon dioxide becomes a limiting factor.

Question 4

what is the optimal temperature for plants photosynthesise?

Answer 4

• 25 degrees Celsius

Question 5

how can temperature prevent the rate of photosynthesis ?

Answer 5

• if temperatures are too high or too low

Question 6

what happens to the enzymes when the temperature is too high or too low?

Answer 6

• at high temperatures the enzymes denature

- at low temperatures the enzymes become inactive

Question 7

what happens to the plant when the environmental temperature is high?

Answer 7

• the stomata close to limit water loss and then carbon dioxide becomes a limiting factor.

Question 8

how does carbon dioxide concentration affect photosynthesis?

Answer 8

• when there is a decrease in CO2 concentration this leads to a decrease in the rate of photosynthesis.
• when there is an increase in CO2 concentration this leads to an increase in the rate of photosynthesis.

Question 9

which two factors of photosynthesis does the graph increase and then level out?

Answer 9

• light intensity

- Carbon dioxide concentration