Biology 9700 · AS & A Level · Transport mechanisms

Transport mechanisms — practice question

(a)[4]

Using the structure of a leaf as your reference, explain how evaporation differs from transpiration.

(b(i))[4]

Using Table 3.1, describe and explain the findings from the investigation.

(b(ii))[3]

The mean transpiration rate for each species was worked out over a 24 hour period. Describe how the rate at night would compare with the rate during the day. Explain your answer.

(b(iii))[1]

Suggest which of the three fruit-tree species is described as ‘drought-resistant’ and would be economical to cultivate in places where water is scarce.

(i)[4]

With reference to Table 3.1, describe and explain the findings of the investigation.

(ii)[3]

The mean transpiration rate for each species was calculated over a $24$ hour period. Describe how the transpiration rate at night would differ from the transpiration rate in the day. Explain your answer.

(iii)[1]

Suggest which of the three fruit-tree species has been described as ‘drought-resistant’ and would be economical to cultivate in places where water is scarce.

(c(i))[2]

Glutathione is a protein that is known to be involved in repairing damaged DNA. Eating sour cherries regularly raises the amount of glutathione in the body. Explain how the fruit helps protect smokers from smoking-related diseases.

(c(ii))[2]

A diet rich in peaches can help cut inflammation in the bronchi and bronchioles. Explain how the fruit helps protect smokers from smoking-related diseases.

Worked solution & mark scheme

This 24-mark question has a full step-by-step worked solution and mark scheme. One marking point: Evaporation means liquid water is converted into water vapour

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