(a) What is immunisation? (b) Categorise the following into acute / chronic / infectious/ non-infectious diseases: typhoid, TB, GOITRE, Elephantiasis

CBSE Class 9 CBSE Class 9 Science
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(a) It is the production of immunity in an individual by artificial means.
(b) Typhoid-Infectious/Acute; TB-Chronic/ Infectious; Goitre - Non - infectious/ acute; Elephantiasis - Infectious/acute.