Factors Affecting Photosynthesis

Question 1

Name the 4 limiting factors for photosynthesis

Answer 1

1) Amount of light
2) Carbon dioxide concentration
3) Amount of chlorophyll
4) Temperature

Question 2

How does the amount of light affect photosynthesis?

Answer 2

• More light = faster rate of photosynthesis

- There is an optimum rate of photosynthesis (rate will continue to increase and level out at optimum)

Question 3

How does carbon dioxide concentration affect the rate of photosynthesis?

Answer 3

• More CO2 = faster rate of photosynthesis

- Until optimum level is reached, rate will increase but begin to level out at optimum level

Question 4

How does temperature affect the rate of photosynthesis?

Answer 4

• Higher temperature = higher rate of photosynthesis
• Graph is shaped like a triangle
• Rate of photosynthesis will DECREASE after around 45 degrees Celsius is reached - enzymes in chlorophyll are destroyed

Question 5

How does the amount of chlorophyll affect the rate of photosynthesis?

Answer 5

• More chlorophyll = More Energy absorbed = quicker rate of photosynthesis

Question 6

Do root hair cells contain chlorophyll? Why/why not?

Answer 6

No

Their function is to absorb nutrients and minerals from 5he soil, not to photosynthesise (no chloroplasts)