Photosynthesis

Question 1

What is the word question for photosynthesis?

Answer 1

Light
Carbon Dioxide + Water ➡️ Sugar + Oxygen
Chlorophyll

Question 2

What is the first stage of photosynthesis called?

Answer 2

Light reactions

Question 3

Describe the light reactions stage of photosynthesis

Answer 3

During the light reactions, light energy from the sun is trapped by chlorophyll in the chloroplasts.

This energy is then used to split water into hydrogen and oxygen. The oxygen is a byproduct that is then released from the leaf by diffusion.

The hydrogen is then carried forward into the second stage

Question 4

What is the second stage of photosynthesis called?

Answer 4

Carbon fixation

Question 5

Describe the carbon fixation stage of photosynthesis

Answer 5

A series of enzyme controlled reactions.

In carbon fixation the ATP and hydrogen produced during the light reactions are used. The energy from ATP allows hydrogen to join with the gas carbon dioxide to form sugar

Question 6

The sugar produced in carbon fixation contains chemical energy. What can the plant use this for?

Answer 6

Respiration
Convert it to starch for storage
Convert it to cellulose for plant cell walls

Question 7

What are the 2 uses of energy absorbed by chlorophyll?

Answer 7

Split waters
Converted into chemical energy in the form of ATP

Question 8

What are the 3 limiting factors for photosynthesis?

Answer 8

Carbon dioxide concentration
Light intensity
Temperature

Question 9

How can you investigate limiting factors?

Answer 9

By measuring the rate of photosynthesis

This can be done by measuring the number of oxygen bubbles per minute using water, sodium hydrogen carbonate solution and the plant elodea