Biology 0610 · IGCSE · Transpiration

Transpiration — practice question

(a(i))[1]

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

(a(ii))[1]

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

(a(iii))[1]

State the purpose of the oil layer above the water in the burette.

(a(iv))[1]

Using the information in Fig. 3.1, describe one way to find out how much water is lost from the leafy shoot.

(b(i))[3]

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

(b(ii))[5]

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

(c(i))[2]

Suggest why the mass of water in the apparatus stays constant when the leafy shoot is kept at 100% relative humidity.

(c(ii))[1]

Explain why the leafy shoot in Fig. 3.1 failed to wilt.

(c(iii))[1]

Predict how water loss will compare with the trend in Fig. 3.2. Sketch your prediction on Fig. 3.2.

Worked solution & mark scheme

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