Photosynthesis

Question 1

Write the summary equation for photosynthesis

Answer 1

Carbon dioxide + water - light energy - sugar + oxygen

Question 2

Describe the light reactions of photosynthesis

Answer 2

During the light reactions, light energy from the sun is trapped by chlorophyll in chloroplasts and is converted into chemical energy which is used to generate ATP.

Water is split to produce Hydrogen and Oxygen. Oxygen diffuses out of the cell.

Question 3

Describe carbon fixation

Answer 3

A series of enzyme-controlled reactions, which use hydrogen and ATP (produced by the light reactions) are combined with carbon dioxide to produce sugar.

Question 4

Describe the fate of the sugar produced by photosynthesis

Answer 4

The chemical energy in sugar is available for respiration or the sugar can be converted into other substances, such as starch for storage, and cellulose which is structural and used in cell walls.

Question 5

Identify the limiting factors of photosynthesis

Answer 5

1. Carbon dioxide
2. Tempature
3. Light intensity