Diseases & Immunity (Cambridge (CIE) IGCSE Combined Science: Biology): Exam Questions

What produces active immunity?

White blood cells defend the human body against pathogens.

State one other way the human body defends itself against pathogens.

Fig. 1.1 shows a sign from a restaurant kitchen.

Fig. 1.1

Explain why the message in the sign is important for controlling the spread of disease.

A person is is given an initial vaccination for a disease. A few weeks later the person is given a booster vaccination. A booster vaccination is an additional vaccination for the same disease.

Fig. 1.2 shows how the number of antibodies in the body of the person changes after each vaccination.

(i) Describe two differences between the response to the initial vaccination and the response to the booster vaccination shown in Fig. 1.2.

[2]

(ii) Place a tick (✓) in the box that describes the response shown in Fig. 1.2.

[1]

Explain how platelets in the blood help defend the body against disease.