Fertilization usually takes place in the (a)______________.

What is (a)?

• uterus

• ovary

• oviduct

• vagina

The process of embedding of the embryo into the (b)______________ is known as implantation.

What is (b)?

• ovary

• wall of the vagina

• wall of the oviduct

• uterine lining

The diagram shows a foetus and the associated structures inside the uterus.

What is structure W?

• placenta

• umbilical cord

• arteriole

• venule

The diagram shows a foetus and the associated structures inside the uterus.

What is structure X?

• amnion

• placenta

• umbilical cord

• uterine wall

The diagram shows a foetus and the associated structures inside the uterus.

What is structure Z?

• amnion

• placenta

• umbilical cord

• uterine wall

The diagram shows a foetus and the associated structures inside the uterus.

Which of the following are functions of the fluid in Y?

• to prevent the foetus from drying out

• to serve as a shock absorber

• to provide nutrients to the foetus

• to provide a stable environment for the foetus to develop

The exchange of oxygen between the foetal blood and maternal blood takes place in the amniotic fluid.

• True

• False

The placenta has numerous villi.

• True

• False

Fraternal twins are developed from one zygote.

• True

• False

Fraternal twins can be of the same sex.

• True

• False