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IGCSE Biology Extended8.3.1—Transpiration as the loss of waterTopic Practice

8.3.1—Transpiration as the loss of water

• Describe transpiration as the loss of water vapour from leaves

Question 15

[Maximum number: 1]

The diagram shows an experiment to investigate transpiration.

plant 1

plant 1

plant 2

plant 2

Plant 1 is not covered. Plant 2 and its pot are covered by a transparent plastic bag.
The mass of each plant and its pot is measured. The masses are measured again after two hours.

What is the result?

A

The mass of both plants decreases by the same percentage.

B

The mass of both plants stays the same.

C

The mass of plant 1 decreases more than the mass of plant 2 .

D

The mass of plant 2 decreases more than the mass of plant 1.

Question 15

[Maximum number: 1]

The diagrams show stages in the passage of water through a plant.
Which arrow shows water moving in the form of water vapour?

Question image

Question 3(b)

[Maximum number: 3]

Stomata are found on the lower surface of broad bean leaves.

Describe the function of stomata.

Question 16

[Maximum number: 1]

What is a description of transpiration?

A

exchange of gases between the leaf and the atmosphere

B

loss of water vapour from the leaves and stems of a plant

C

movement of water from the roots to the leaves

D

movement of water through the cells of the leaf

Question 16

[Maximum number: 1]

What will increase the rate of transpiration in a plant?

A

an increase in the humidity of the atmosphere surrounding the leaf

B

an increase in the surface area of the cell surfaces inside the leaf

C

a decrease in the number of stomata present on the surface of the leaf

D

a decrease in the temperature of the atmosphere surrounding the leaf

Question 16

[Maximum number: 1]

What is a description of transpiration?

A

exchange of gases between the leaf and the atmosphere

B

loss of water vapour from the leaves of a plant

C

movement of water from the roots to the leaves

D

movement of water through the cells of the leaf

Question 3(a)(i)

[Maximum number: 1]

Fig. 3.1 shows some apparatus that was used to investigate water loss from a leafy shoot.

Fig. 3.1

Fig. 3.1

State the name of the process by which leafy shoots lose water.

Question 17

[Maximum number: 1]

By which process is water lost from a leaf?

A

active transport

B

diffusion

C

osmosis

D

photosynthesis

Question 18

[Maximum number: 1]

Which process releases water vapour into the atmosphere from the leaves of trees?

A

active transport

B

osmosis

C

respiration

D

transpiration

Question 18

[Maximum number: 1]

What is part of the definition of transpiration?

A

the loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells

B

the movement of molecules into the cells of the organism where they are used

C

the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration

D

the transport of mineral ions from the roots into the stem and leaves

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