Rate Of Photosynthesis

Question 1

What can slow down the rate of photosynthesis?

Answer 1

• light
• Carbon dioxide
• Temperature

Question 2

What does light provide for photosynthesis?

Answer 2

Energy

Question 3

As the light level is raised what happens to the rate of photosynthesis?

Answer 3

Steadily increases

Question 4

What happens to the rate of photosynthesis reaches a certain point when light is a limiting factor? Why?

Answer 4

Beyond the point it won’t make any difference as the rate keeps increasing the rate will no longer increase. This is because it will either be the temperature or CO2 level that is now the limiting factor.

Question 5

In a lab you can change light intensity by….

Answer 5

Moving a lamp closer or further away from the plant

Question 6

As the CO2 level is raised what happens to the rate of photosynthesis?

Answer 6

Steadily increases

Question 7

What happens to the rate of photosynthesis reaches a certain point when CO2 concentration is a limiting factor? Why?

Answer 7

Beyond the point it won’t make any difference as the rate keeps increasing the rate will no longer increase. This is as long as light and CO2 are in plentiful supply then the factor limiting photosynthesis is temperature.

Question 8

Why would be a limiting factor of photosynthesis?

Answer 8

The limiting factor is too low

Question 9

What happens to the enzymes at a low temperature?

Answer 9

Work more slowly.

Question 10

What happens to the enzymes needed for photosynthesis if the temperature is too hot?

Answer 10

They will be damaged

Question 11

What can be used to measure the effect of light intensity on the rate of photosynthesis?

Answer 11

Canadian pondweed

Question 12

The rate at which the pond weed produces oxygen corresponds to what?

Answer 12

The rate at which it is photosynthesising

Question 13

The faster the rate of oxygen production the faster the rate of ___________________?

Answer 13

Photosynthesis

Question 14

What is the first 2 steps carried out on the pond weed practical?

Answer 14

1) The source of light is placed at a specific distance from the pond weed.

2) The pond weed is left to photosynthesis for a set amount of time. As it photosynthesises the oxygen released will form bubbles.

Question 15

What is the 3rd step for the pondweed practical?

Answer 15

Count the bubbles as they are being produced. This is the volume of O2 produced