PHOTOSYNTHESIS (5):LIMITING FACTORS

Question 1

Name 3 factors which can limit the rate of photosynthesis?

Answer 1

Temperature, Carbon dioxide , Light intensity

Question 2

How is temperature a limiting factor to photosynthesis?

Answer 2

photosynthesis is controlled by enzymes

Question 3

Why is low temperatures a limiting factor in photosynthesis?

Answer 3

Low temps=rate of photosynthesis is limited by the number of collisions between enzymes and substrate.

Temp increase=Number of collisions increase

therefore the rate of photosynthesis increases.

However, at high temperatures, enzymes are denatured and this will decrease the rate of photosynthesis

Question 4

How is carbon dioxide a limiting factor in photosynthesis?

Answer 4

Photosynthesis increases at first but then is limited by a lack of temp/light

Question 5

Why is carbon dioxide a limiting factor in photosythesis?

Answer 5

Carbon dioxide - with water - is one of the reactants in photosynthesis.

If the concentration of carbon dioxide is increased, the rate of photosynthesis will therefore increase

After this light/temp is a limiting factor

Question 6

How is light intensity a limiting factor of photosynthesis?

Answer 6

Not enough light= a plant cannot photosynthesise very quickly - despite there being lots of water and carbon dioxide and a suitable temperature.

Increasing the light intensity increases the rate of photosynthesis , until some other factor - a limiting factor - becomes in short supply.

Question 7

Words to interpret ate a graph

Answer 7

levels of, optimum temperature, increases, limiting factor