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3.2 Coordination and control – the endocrine system

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Question 6

During a canine fertility treatment, only 55–85%55\text{--}85\%55–85% of the egg cells retrieved are mature enough to be used.

Of those mature egg cells, only 65–75%65\text{--}75\%65–75% will be successfully fertilised.

Calculate the maximum number of fertilised egg cells that can be produced if 161616 egg cells are retrieved.

Give your answer to the nearest whole number.

[3]
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3.2 Coordination and control – the endocrine system Questions

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

23 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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