Given below are four methods and their modes of action in achieving contraception. Match the following.
a) Pill - Prevents sperm reaching cervix
b) Condom - Prevents implantation
c) Vasectomy - Prevents ovulation
d) Copper T - Semen contain no sperm.

Which of the following is an outbreeding device? a. If pollen release and stigma receptivity are not synchronised. b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower. c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilising the ovules by inhibiting pollen germination or pollen tube growth in the pistil. d. Production of the unisexual flower

A list of contraceptive methods are given. Categorise them into natural, barrier, IUDS. Oral contraceptives, Surgical. Condoms. Coitus interruptus, Diaphragms, Vasectomy, Copper T, Pills, LactationalAmenorMea, Loop. Tubectomy, Cervical caps, Cu 7, Periodic Abstinence.