B2.3

Question 1

Photosynthesis is summarised by the equation

Answer 1

Carbon dioxide + water (+ light energy) –> glucose + oxygen

Question 2

During photosynthesis light energy is absorbed by a green substance called

Answer 2

Chlorophyll

Which is found in chloroplasts in some plants and algae

Question 3

This energy is used by converting carbon dioxide (from the air) and water (from the soul) into

Answer 3

Sugar (glucose)

Question 4

Oxygen is released as a

Answer 4

By-product

Question 5

The rate of photosynthesis may be limited by:

Answer 5

Shortage of light

Low temperature

Shortage of carbon dioxide

Question 6

Light, temperature and the availability of carbon dioxide interact and in practice any one of them may be the factor that limits

Answer 6

Photosynthesis

Question 7

The glucose produced in photosynthesis may be converted into

Answer 7

Insoluble starch for storage

Question 8

Plant cells use some of the glucose produced during photosynthesis for

Answer 8

Respiration

Question 9

Some glucose in plants and algae is used:

Answer 9

To produce fat or oil for storage

To produce cellulose which strengthens the cell wall

To produce proteins

Question 10

To produce proteins plants also use

Answer 10

Nitrate ions that are absorbed from the soil