Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

Arrange the following hormones in sequence of their secretion in a pregnant woman. Mention their source and the function they perform:

hcG, LH, FSH, Relaxin

What are interferons?

Mention role of interferons

Name the cells that are released from the above-mentioned gland. Mention how they help in immunity.

State the Function of Chorionic Villi

How do cytokine barriers provide innate immunity in humans?

Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.

Explain the relationship between B-lymphocytes and T-lymphocytes developing an immune response.

It is said that vaccinations are a must for a healthy society. Justify.

How does the human body respond when vaccine is introduced into it?

Answer the following question:
The principle of vaccination is based on the property of the "memory" of the immune system. Taking one suitable example, justify the statement.

Answer the following question.
Differentiate between the roles of B-lymphocytes and T-lymphocytes in generating immune responses.

Mention one application for the following:

Cytokinin-barrier

State the functions of mast cells in allergy response.

State the function of interpherons.

State the role of the thymus as a lymphoid organ. Name the cells that are released from it and mention their function.

Mention one application of the following:
Passive immunization

Mention one application of the following:
Antihistamine

Mention one application of the following:
Colostrum

Gonads develop from embryonic ______.