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Cambridge IGCSE Biology practice

Why do shoots exhibit phototropism and gravitropism?

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Tropic responses

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Why do shoots exhibit phototropism and gravitropism?.

  1. A.To optimize growth direction using chemical signals
  2. B.To produce flowers
  3. C.To absorb water
  4. D.To fix nitrogen

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Paper 4 structured question: Tropic responses

Paper 4Theory (Extended)6 marks

Description

Phototropism and Gravitropism

Phototropism causes shoots to grow towards light, while gravitropism causes shoots to grow upwards against gravity. Both responses involve the redistribution of auxin, which promotes cell elongation on one side of the shoot, causing bending.

  1. a

    State the direction of shoot growth in phototropism and gravitropism.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Explain how auxin causes shoots to bend during phototropism.

    Aim for approximately 4 distinct marking points.

    [4]