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Plant hormones: exam questions

2 questions, 6 marks. Write your answers on paper, then open each mark scheme.

Spec 4.5.4
Triple only (what this means)Triple only: only in Triple Biology. Combined Science students can skip it. What the labels mean
Questions and mark scheme (PDF)2 pages

Question 1

Triple only (what this means)Triple only: only in Triple Biology. Combined Science students can skip it. What the labels mean

In a required practical, a student grew seedlings in a box with a slit that let light in from one side only. After three days the shoots had bent towards the slit. Explain why.

[3 marks]
Show mark scheme for question 1
  • auxin is unequally distributed / builds up on the shaded side of the shoot (1)
  • cells on the shaded side grow (elongate) faster (1)
  • so the shoot bends towards the light (1)

Question 2

Triple only (what this means)Triple only: only in Triple Biology. Combined Science students can skip it. What the labels mean
Higher tier (what this means)Higher tier: only on the Higher tier papers. Foundation students can skip it. What the labels mean

Give three ways in which plant hormones are used in agriculture, horticulture or the food industry.

[3 marks]
Show mark scheme for question 2
  • auxins as weed killers / rooting powders / for tissue culture (1)
  • ethene to control ripening of fruit during storage and transport (1)
  • gibberellins to end seed dormancy / promote flowering / increase fruit size (1)
  • allow any three different uses
  • Max 3
Stuck on one?Read the notesFlashcards