1.1. The diagram shows the human female reproductive system.

(i) Which label shows where ovulation occurs?

(1)

(ii) Which label shows where fertilisation usually occurs?

(1)

1.2. The diagram shows the changes in thickness of the uterus lining and levels of two hormones produced by the ovary during a menstrual cycle.

(i) Hormones X and Y are produced by the ovaries.

Name X and Y.

(2)

(ii) Explain the function of hormone X during the menstrual cycle.

(2)

1.3. The diagram shows a human fetus developing in the uterus.

Explain how the structure of the placenta enables the efficient exchange of substances between the fetus and the mother.