Biology 9700 · AS & A Level · Infectious diseases

Infectious diseases — practice question

Malaria is an illness caused by the protoctist Plasmodium. This organism has a very complex life cycle because it uses two hosts, a human and a mosquito.
(a)[1]

Name one of the four Plasmodium species that infect humans.

(b)[1]

State the name of the mosquito that serves as the host to Plasmodium.

(c)[2]

Suggest why an electron microscope, rather than a light microscope, was used to obtain this image.

(d)[3]

Use the scale bar to calculate the magnification of the image in Fig. 3.1. Write down the formula and apply it in your calculation. Show your working.

(e)[2]

Outline the mosquito’s role in transmitting malaria.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: Correct Plasmodium species named

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