(a) What substances are contained (i) in oral pills, and (ii) in vaginal pills, used as contraceptives ? How do they work ? (b) How does copper-T prevent pregnancy ? (c) Name the disease caused by HIV.

(a) What substances are contained (i) in oral pills, and (ii) in vagin

1.	(a) What substances are contained (i) in oral pills, and (ii) in vaginal pills, used as contraceptives ? How do they work ? (b) How does copper-T prevent pregnancy ? (c) Name the disease caused by HIV.
Answer» (a) What substances are contained (i) in oral pills, and (ii) in vaginal pills, used as contraceptives ? How do they work ? (b) How does copper-T prevent pregnancy ? (c) Name the disease caused by HIV.