Biology 9700 · AS & A Level · Transport mechanisms

Transport mechanisms — practice question

Nerium oleander is a xerophytic plant. Fig. 3.1 shows a photomicrograph of a section across a leaf of N. oleander.
(a)[3]

Explain how a multilayered epidermis and stomatal crypts help N. oleander reduce water loss.

(b)[1]

Name the cells specialised for transporting assimilates in N. oleander.

(c)[2]

Explain the difference between a source and a sink.

(d(i))[1]

State what is meant by a gene mutation.

(d(ii))[1]

Suggest one way in which the mutation of cyFBP prevents the synthesis of cyFBPase.

(e(i))[4]

Describe the events in the body of the small mammal that lead to the formation of the cells needed for monoclonal antibody production.

(e(ii))[1]

State the expected results after adding the monoclonal antibody that would confirm that cyFBPase is absent from the leaf extracts.

(f)[2]

Suggest why plants with the cyFBP mutation will store less starch in their roots.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: A multilayered epidermis lowers water loss

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