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3.2 Coordination and control – the endocrine system

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Question 4
F

A student investigates how the roots of bean seedlings respond to gravity.

  • She places two bean seedlings on their sides, so that the roots are horizontal.
  • Seedling 1 is left in a fixed position.
  • Seedling 2 is put on a clinostat. A clinostat rotates slowly, so every side of the seedling faces downwards in turn.
  • Both seedlings are kept in the dark for 2 days.

After 2 days, the root of seedling 1 has grown downwards. The root of seedling 2 has grown straight, along the horizontal.

a.

Name the response of the root of seedling 1 to gravity.

[1]
b.

Explain why the root of seedling 2 grew straight.

[2]
c.

Explain how auxin causes the root of seedling 1 to grow downwards.

[3]
d.

Explain why both seedlings were kept in the dark.

[1]
Markscheme

3.2 Coordination and control – the endocrine system Questions

  1. GCSE
  2. /Biology
  3. /3.2 Coordination and control – the endocrine system

84 exam-style questions on OCR GCSE Biology 3.2 Coordination and control – the endocrine system, covering 3.2.1 Principles of hormonal coordination and control, 3.2.2 Roles of thyroxine and adrenaline, 3.2.3 Hormones in human reproduction, 3.2.4 Interactions of reproductive hormones, 3.2.5 Hormones in contraception, 3.2.6 Hormones in reproductive technologies, 3.2.7 Plant hormones in growth and coordination, 3.2.8 Effects of plant hormones, and 3.2.9 Uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.

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