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CAIE IGCSE Biology 16.5 Human Sex Hormones

Practise human sex-hormone questions by reading menstrual-cycle graphs, locating hormone production sites and explaining FSH, LH, oestrogen and progesterone control.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • link testosterone and oestrogen to puberty changes and ovarian hormone release
  • read menstrual-cycle diagrams to identify ovulation, menstruation and uterus-lining changes
  • explain FSH, LH, oestrogen and progesterone roles, production sites and graph lines

Covered syllabus points

16.5.1—Roles of testosterone and oestrogen16.5.2—Menstrual cycle in terms of changes16.5.3—Sites of production of oestrogen16.5.4—Role of hormones in controlling

16.5 Sex hormones in humans question 1

[Maximum number: 3]

Chlamydia can damage the reproductive system.

Describe the role of oestrogen at puberty.

16.5 Sex hormones in humans question 2

[Maximum number: 6]

Question (a)

(a)

Fig. 1.1 shows the changes in the concentration of two hormones involved in the menstrual cycle.

Fig. 1.1

Fig. 1.1

[ 6 ]

Question (i)

(i)

State the names of the hormones Y and Z in Fig. 1.1.

Y
Z

[ 2 ]

Question (ii)

(ii)

On Fig. 1.1, sketch a line to show the levels of progesterone through the 28-day menstrual cycle.

[ 2 ]

Question (iii)

(iii)

State the day in the 28-day menstrual cycle when the egg is most likely to be released from a follicle.

[ 1 ]

Question (iv)

(iv)

State the main site of progesterone production during pregnancy.

[ 1 ]
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