Given below are some human organs. Identify one primary and one secondary lymphoid organ. Explain its role. Liver, thymus, stomach, thyroid, tonsils.

Name and explain the type of barriers which involve macrophages.

What are interferons? Mention their role.

List out chemical alarm signals produced during inflammation.

Explain the process of replication of retrovirus after it gains entry into the human body.

Name the phases in the life cycle of Plasmodium 

Name the causal agent of swine flu. Mention two symptoms.

Name the causal agent of Quartan malaria and Mild tertian malaria.

What steps should be taken to maintain good health?

Differentiate between infectious and non-infections disease.

Name the causative agent and confirmatory test for Typhoid.

Malaria Eradication programme launched by WHO is a failure. Why?

What do you mean by the term personal hygiene?

Define haematopoiesis.

Point out any four peripheral lymphoid organs.