Name and explain the type of immunity that is provided by injecting microbes deliberately during immunisation into the human body.

2

(a)

Why does a doctor administer tetanus antitoxoid and not a tetanus vaccine to a child injured in a roadside accident with a bleeding wound?Explain.

2

(a)

Why are the tumour cells dangerous?

2

(a)

(a) Explain the property that prevents normal cells from becoming cancerous.
(b) All normal cells have inherent characteristic of becoming cancerous.Explain.

2

(a)

Name the types of barrier of innate immune system, which involves
(i) HCI of stomach    
(ii) macrophages.

2

(a)