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5.4 Plant hormones

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Question 3

A botanic garden tests a new batch of rooting powder before using it to clone a rare plant. The powder is approved only if:

  • at least 80% of the cuttings treated with the powder grow roots
  • the percentage that grow roots is at least 20 percentage points higher than for cuttings not treated with the powder.

The results are shown in the table.

TreatmentNumber of cuttingsNumber that grew roots after 21 daysNumber alive 14 days after transfer to soil
No rooting powder402218
Rooting powder403430
a.

Evaluate whether the rooting results meet both conditions for approving the powder.

[3]
b.

Explain how auxin in the rooting powder could have caused more of the treated cuttings to remain alive after transfer to soil.

[2]
Markscheme

5.4 Plant hormones Questions

  1. GCSE
  2. /Biology
  3. /5.4 Plant hormones

87 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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