Photosynthesis and Plant Growth

Question 1

Suggest a benefit to a plant of being day neutral

Answer 1

• plant can flower at any time

Question 2

A plant flowering in response to the number of hours of darkness and light is?

Answer 2

Photoperiodism

Question 3

Suggest how bamboo plants benefit from having poisonous leaves

Answer 3

• less likely to be eaten by animals

Question 4

Percentage Change Formula

Answer 4

(final-initial/initial) x 100

Question 5

Explain which compost would be best for a pot containing strawberry plants grown during a hot summer

Answer 5

• Compost B because it has the highest percentage of water retained
• There is a higher amount of water loss in the plants due to high temperatures causing high transpiration rates

Question 6

State one way to improve this investigation to compare these results in an easier way

Answer 6

• Use the same starting mass of compost

Question 7

Explain why reducing water content of the strawberries will help to preserve them

Answer 7

• reducing water content reduces the number of microorganisms that can reproduce
• reduction in microorganisms reduces decaying process

Question 8

Give a reason for sterilising the jam jars

Answer 8

• to kill unwanted microorganisms

Question 9

Use information from Figure 10 to describe the effect of light intensity on the rate of photosynthesis.

Answer 9

• as light intensity decreases, rate of photosynthesis decreases
• after 20cm away, light intensity seems to have little effect on the rate of photosynthesis

Question 10

Give another method of measuring light intensity

Answer 10

• Use a light meter

Question 11

Explain what would happen to the level of gas produced if the light intensity decreased

Answer 11

• Volume of gas produced would decrease to below 4 bubbles

- Because light is needed for photosynthesis