Name the disease caused by HIV.

What substances are contained (i) in oral pills, and (ii) in vaginal pills, used as contraceptives? How do they work?

How does copper-T prevent pregnancy?

What is the name of surgical method of birth control (or preventing pregnancy) which is carried out (i) in men, and (ii) in women ?

Name the part of a seed which (i) contains stored food (ii) grows into root, and (iii) grows into shoot.