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Cambridge IGCSE Biology

14.5Tropic responses

Tropic responses in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 14.5.1Describe gravitropism and phototropism and investigate them in shoots and roots.
  2. 14.5.2Supplement: explain phototropism and gravitropism of a shoot as chemical control of growth by auxin.

Lessons

  • Tropisms and plant hormones

    30 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Exam style

Tropic responses: sample question

1 mark

Young sorghum seedlings are grown in a closed box with a narrow slit on one side, so that light enters only through the slit. What happens to the shoots after a few days?

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