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3.2 Coordination and control – the endocrine system

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Question 7
F

A student investigates the effect of auxin concentration on the growth of shoots.

  • She removes the tips from some shoots.
  • She cuts sections 10.0 mm long from the shoots.
  • She puts the sections in auxin solutions of different concentrations for 24 hours.
  • She then measures the length of each section and calculates the mean.

The Table shows the results.

Table

Concentration of auxin in mg/dm3\text{mg/dm}^3mg/dm3Mean length of section after 24 hours in mm\text{mm}mm
011.0
0.112.5
114.0
1012.0
10010.5
a.

Calculate the percentage increase in length of the sections in 1 mg/dm3 of auxin.

[2]
b.

Describe the effect of auxin concentration on the growth of the sections.

Use data from the Table in your answer.

[2]
c.

Identify the independent variable in this investigation.

[1]
d.

Explain why the student removed the tips from the shoots.

[2]
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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