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CAIE IGCSE Biology 8 Transport in Plants

Practise tracing water, mineral ions, sucrose and amino acids through roots, xylem, leaves and phloem.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

8.1 Xylem and phloem8.2 Water uptake8.3 Transpiration8.4 Translocation

8. Transport in plants question 1

[Maximum number: 3]

Question (a)

(a)

State two substances that are transported only in the phloem.

[ 1 ]

Question (b)

(b)

Explain why some parts of a plant can act as both a source and a sink.

[ 2 ]

8. Transport in plants question 2

[Maximum number: 1]

The diagram shows a bean seedling soon after it has germinated.
Where is most water absorbed?

Figure for Question 8. Transport in plants question 2 — CAIE IGCSE Biology

8. Transport in plants question 3

[Maximum number: 16]

Question (a)

(a)

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

Fig. 3.1

Fig. 3.1

[ 4 ]

Question (i)

(i)

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

[ 1 ]

Question (ii)

(ii)

Before the leafy shoot is inserted into the jar shown in Fig. 3.1, it must be recut under water.

Suggest why the end of the leafy shoot was cut under water.

[ 1 ]

Question (iii)

(iii)

State the purpose of the oil layer on top of the water in the burette.

[ 1 ]

Question (iv)

(iv)

Using the information in Fig. 3.1, describe one method that can be used to determine how much water is lost from the leafy shoot.

[ 1 ]

Question (b)

(b)

The apparatus shown in Fig. 3.1 was used to investigate the effect of temperature on the rate of water loss in a species of plant. The results are shown in Fig. 3.2.

Fig. 3.2

Fig. 3.2

[ 8 ]

Question (i)

(i)

Using the information in Fig. 3.2, calculate how much water would be lost from 1 m21 \mathrm{~m}^{2} of leaves in 12 hours if the plants were kept at 35∘C35^{\circ} \mathrm{C}. Include the unit.

[ 3 ]

Question (ii)

(ii)

Using the information in Fig. 3.2, describe and explain the effect of increasing temperature on the rate of water loss in this species of plant.

[ 5 ]

Question (c)

(c)

The apparatus shown in Fig. 3.1 can also be used to investigate the effects of changing humidity on water loss in plants.

[ 4 ]

Question (i)

(i)

Suggest why the mass of water in the apparatus does not change when the leafy shoot is kept at 100 % relative humidity.

[ 2 ]

Question (ii)

(ii)

Even at extremely low relative humidities the leafy shoot did not wilt.

Explain why the leafy shoot shown in Fig. 3.1 did not wilt.

[ 1 ]

Question (iii)

(iii)

The investigation on the effect of temperature was done at a relative humidity of 20 %.

The investigation was repeated at a relative humidity of 80 % and all other conditions were kept the same.

Predict how the water loss will differ from the trend shown in Fig. 3.2.
Sketch your prediction on Fig. 3.2.

[ 1 ]

8. Transport in plants question 4

[Maximum number: 2]

Question (a)

(a)

Fig. 6.1 is a diagram showing some parts of a plant. The circle shows a magnified cross-section of part of the stem.

Fig. 6.1

Fig. 6.1

[ 2 ]

Question (i)

(i)

State the name of the process that describes the transport of sucrose in a plant.

[ 1 ]

Question (ii)

(ii)

State one letter from Fig. 6.1 that is a structure that is an example of a source for sucrose transport.

[ 1 ]
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