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Cambridge IGCSE Biology practice

Paper 3 structured question: Sex hormones in humans

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Sex hormones in humans

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Paper 3Theory (Core)1 marks

During puberty, certain hormones cause the development of secondary sexual characteristics in males and females.

Description

Hormones and Secondary Sexual Traits

Testosterone is the main hormone responsible for male secondary sexual traits, while oestrogen is the main hormone responsible for female secondary sexual traits.

  1. a

    Describe one secondary sexual characteristic caused by testosterone in males.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Sex hormones in humans

Paper 3Theory (Core)3 marks

Description

Testosterone and Oestrogen

Testosterone is produced mainly in the testes and causes male secondary sexual traits. Oestrogen is produced mainly in the ovaries and causes female secondary sexual traits.

  1. a

    Identify the hormone responsible for breast development in females.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how testosterone affects the voice during puberty in males.

    Aim for approximately 2 distinct marking points.

    [2]