Sex hormones in humans — Paper 1 · IGCSE Biology (9-1) 0970

28 The diagram shows a timeline of a woman’s menstrual cycle, which lasts for 28 days. 13 14 15 16 12 17 11 18 10 19 9 20 8 21 7 22 6 23 5 menstruation 24 (period) 4 25 3 26 2 27 1 28 On which days of the menstrual cycle is a woman most likely to become pregnant? A days 1– 4 B days 7–10 C days 13–16 D days 20–23

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2018

30 In humans, what is an example of a secondary sexual characteristic in both males and females? A hair grows on face B hips widen C fat is deposited on hips and thighs D sexual organs grow

1 marks

Answer: D

This question in 0970/11 May/June 2019

29 The graph shows the decline in testosterone production as men get older. 120 100 testosterone 80 production 60 / arbitrary units 40 20 0 20 30 40 50 60 70 80 90 age / years Which age range shows the greatest decline in testosterone production? A 40 to 50 years B 50 to 60 years C 60 to 70 years D 70 to 80 years

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2019

23 What causes the development of female secondary sexual characteristics? A adrenaline production B menstrual cycle starting C oestrogen production D ovulation occurring

1 marks

Answer: C

This question in 0970/11 May/June 2020

29 What happens to the uterus lining during menstruation? A breaks down B new blood vessel growth C implantation of embryo D repair and thickening

1 marks

Answer: A

This question in 0970/11 May/June 2020

29 When do the following stages occur in a typical human menstrual cycle? bleeding ovulation A days 13 – 14 days 6 – 25 B days 1 – 4 days 27 – 28 C days 6 – 25 days 1 – 4 D days 1 – 4 days 13 – 14

1 marks

Answer: D

This question in 0970/12 May/June 2020

28 Which row matches each hormone to its function? causes the growth reduces blood repairs the widens of facial hair glucose concentration lining of the uterus the pupils A oestrogen insulin testosterone adrenaline B oestrogen insulin insulin testosterone C testosterone adrenaline insulin oestrogen D testosterone insulin oestrogen adrenaline

1 marks

Answer: D

This question in 0970/11 May/June 2021

32 The graph shows a woman’s body temperature during the menstrual cycle. 37 body temperature / °C 36 menstruation 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 day On which days is the woman most likely to become pregnant? A days 0–5 B days 6–12 C days 13–18 D days 19–28

1 marks

Answer: C

This question in 0970/11 May/June 2021

31 Which hormone causes the development of secondary sexual characteristics in human males? A adrenaline B insulin C progesterone D testosterone

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2022

34 Which secondary sexual characteristic is caused by both testosterone and oestrogen? A breast development B changes in body shape C growth of facial hair D sudden deepening of voice

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2024

27 Which secondary sexual characteristic is associated with testosterone? A breast development B facial hair growth C start of the menstrual cycle D widening of hips

1 marks

Answer: B

This question in 0970/12 May/June 2025

28 The diagram shows a human menstrual cycle. day 0 X day 21 Z day 7 Y day 14 What are represented by X, Y and Z? the lining of the uterus an ovary releases a thick uterus lining is breaking down an egg is maintained A X Y Z B X Z Y C Z Y X D Z X Y

1 marks

Answer: A

This question in 0970/12 May/June 2025