Limiting Factors In Photosynthesis

Question 1

Why is a temperature of 25 degrees needed?

Answer 1

Below 10 degrees enzymes are inactive

Above 45 degrees enzymes will denature - stomata also close

Question 2

Why is CO2 needed at 0.4%?

Answer 2

Increases rate of PS

Any higher and the stomata close

Question 3

What is the saturation point?

Answer 3

Something else is the limiting factor e.g. CO2 levels, temperature

Question 4

How do growers ensure the CO2 concentration?

Answer 4

CO2 is added to the air e.g. Burning a small amount of propane in a CO2 generator

Question 5

How do growers ensure the maximum light intensity?

Answer 5

Lamps are provided at night time or when sunlight is reduced

Question 6

How do growers ensure an optimum temperature?

Answer 6

Greenhouses trap heat energy - warms air

Heaters and cooling systems can also be used to keep a constant optimum temperature

Question 7

Why is a high light intensity of a certain wavelength needed?

Answer 7

More energy provided

Only certain wavelengths of light are used for photosynthesis - blue and res