Nutrition in plants 4E/4N

The diagram shows some plant root cells. Which of the following statements about the water potential of the labelled regions is true?

• water potential of region P is zero

• water potential of region R is higher than that of region Q

• water potential of region R is lower than that of region S

• water potential of region S is lowest

The diagram shows a section through the leaf. Which region does not convert light energy into chemical energy?

• A

• B

• C

• D

The diagram shows a section through a leaf. Which layer on the diagram contains a stoma?

• A

• B

• C

• D

Chlorophyll is a green substance found in the cells of plants. What is the function of chlorophyll?

• It converts glucose into energy

• it converts light energy into chemical energy

• it converts oxygen into carbon dioxide

• it converts starch into glucose

During photosynthesis, where does the greatest conversion of light energy into chemical energy take place?

• A

• B

• C

• D

The diagram shows the apparatus used to investigate oxygen production from an aquatic plant.

The experiment was repeated several times to calculate the average volume of oxygen produced. Which 2 factors must be kept constant in each repeat experiment?

• the size of aquatic plant and the amount of oxygen in the measuring cylinder

• the size of aquatic plant and the time exposed to sunlight

• the size of the beaker and the size of the funnel

• volume of water in the beaker and the height of the measuring cylinder

Where are carbohydrates made in a leaf?

• cell vacuoles

• chloroplasts

• phloem

• xylem

a box is placed on some grass for a week.

When the box is lifted, the grass underneath has turned yellow.

This is caused by a lack of...

• carbon dioxide

• light

• oxygen

• water