4NA Plant

The function of chlorophyll is to

• absorb oxygen

• convert light energy to chemical energy

• release energy from carbohydrates

• store raw materials for photosynthesis

Which two chemical substances are required for photosynthesis?

• carbon dioxide and glucose

• glucose and oxygen

• oxygen and water

• water and carbon dioxide

During bright sunlight, which enters a green leaf through its stomata?

• carbon dioxide only

• light

• oxygen

• water

Which equation represents the chemical changes which take place as a result of photosynthesis?

• carbon dioxide + glucose → oxygen + water

• carbon dioxide + oxygen → glucose + water

• carbon dioxide + water → glucose +oxygen

• glucose + oxygen → carbon dioxide + water

The diagram shows the arrangement of cells inside a leaf of a green plant. Which cells normally contain chloroplasts?

• 1 and 2

• 1 and 4

• 2 and 3

• 2 and 4

The diagram shows a section through a leaf. During photosynthesis, where does the greatest conversion of light energy to chemical energy take place?

• A

• B

• C

• D

The diagram shows the movement of water molecules in a leaf from the xylem to the atmosphere. At which stage does evaporation occur?

• A

• B

• C

• D

The diagram shows the pathway of water through a flowering plant. Where does most transpiration take place?

• A upper surface of leaf

• B lower surface of leaf

• C stem

• D root

In an experiment, a plant was placed in a flask as shown below and left for 6 hours in a garden. Its mass was measured before and after the experiment. Which of the following could best explain this result?

• Absorption of water from root hairs

• Evaporation of water from the flask

• Translocation

• Transpiration

When is the transpiration rate of a well-watered plant highest?

• on a cool, dry windy day

• on a cool, wet windy day

• on a hot, dry windy day

• on a hot, wet windy day