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6.3 Plant hormones

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Question 13
F

Auxin cannot pass through thin sheets of a mineral called mica.

A student set up three shoots, P, Q and R. All three shoots received light from the right-hand side only.

  • Shoot P had a mica sheet pushed vertically down through the centre of the tip, separating the left half from the right half.
  • Shoot Q had a mica sheet pushed horizontally into the left-hand (shaded) side, just below the tip.
  • Shoot R had no mica sheet.

After two days, shoot R had bent towards the light. Shoots P and Q had not bent towards the light.

a.

Explain why shoot P did not bend towards the light.

[3]
b.

Explain why shoot Q did not bend towards the light.

[2]
c.

Give the reason why shoot R was included.

[1]
d.

Explain what these results show about how auxin causes shoots to bend towards light.

[2]
Markscheme

6.3 Plant hormones Questions

  1. GCSE
  2. /Biology
  3. /6.3 Plant hormones

105 exam-style questions on Edexcel GCSE Biology 6.3 Plant hormones, covering 6.3.1 Plant hormones and tropisms and 6.3.2 Commercial uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.

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