i)

Teenage pregnancy is when a girl under age 20 conceives/takes seed.

OR

Teenage pregnancy is when female/girls under the age of 20 get pregnant.

OR

Teenage pregnancy is when a female/girl under the age of 20 engages in sexual activity and becomes pregnant either intentionally or unintentionall.

ii)

Causes of teenage pregnancy

1. Poverty
2. Single parenthood
3. Rape
4. Peer pressure, etc.

(i)

Indiscriminate sex is the act of having sexual intercourse with any person or having many/multiple/different sexual partners.

(ii)

Reasons why teenagers indulge in indiscriminate sex

1. Peer pressure
2. Lack of parental guidance
3. Poor financial status of parents/poor homes
4. Lack of sex education
5. Weak morals/exposure to pornographic material

i)

Embryo is the first stage of the development of a zygote (eight weeks after conception in mammals).

ii)

In the womb or uterus of the female mammal

iii)

How a developing embryo breathes in oxygen

Oxygen from the mother's blood diffuses through the placenta into the embryo.

i)

Sense organs in mammals

1. Eyes
2. Ears
3. Nose
4. Tongue
5. Skin

ii)

Function of the sense organs

1. Eyes → for sight
2. Ears → for hearing
3. Nose → for smelling
4. Tongue → for tasting
5. Skin → for feeling and excreting sweat

i)

Fertilization is the fusion of the male and female sex cells to form a zygote.

ii)

The processes that lead to fertilization in humans after mating

1. The sperms move through the vagina, cervix and uterus to the fallopian tube
2. Only one of the millions of sperms succeeds to penetrate the membrane of the ovum
3. The nuclei of the sperm and ovum unit/fuse to form a zygote

i)

Penis

It is used to introduce/discharge sperms into the vagina.

ii)

Ovary

It produces female gametes/sex cells/ova/hormones.

iii)

Oviduct

It is a place where fertilization occurs/passage for the egg released from the ovary to the uterus.

iv)

Testis

Produces sperms/male gametes/sex cells/hormones.

v)

Uterus

Site for implantation/attachment of embryo.