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Learning objective

Describe (HT only) the use of auxins as selective weed killers.

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Topic

Plant hormones (biology only)

Subtopic

Use of plant hormones (HT only)

Aqa Gcse BiologyHomeostasis and response

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Quick explanation

Describe (HT only) the use of auxins as selective weed killers

  • This point belongs to Plant hormones (biology only), especially Use of plant hormones (HT only).
  • You need to be able to describe (HT only) the use of auxins as selective weed killers.
  • The key ideas to know are weed killer, HT only, and auxins.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

weed killerHT onlyauxins

Why it matters

This objective helps connect Use of plant hormones (HT only) to exam-style questions, flashcards, and revision notes for Plant hormones (biology only).

Quick student answer

How does (HT only) the use of auxins work?

Direct answer

In Biology, this page helps you answer questions about (HT only) the use of auxins within Plant hormones (biology only). Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are auxins and selective weed killers.

Key terms

  • auxins: In Use of plant hormones (HT only), auxins means plant hormones that promote growth and are used as selective weed killers in agriculture. This matters in Plant hormones (biology only) because it supports the learning objective to describe (HT only) the use of auxins as selective weed killers. Use auxins only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.
  • selective weed killers: Herbicides that target specific plant species, often utilizing auxins to control unwanted vegetation.

Common trap

Misunderstanding the Mechanism of Action: Students should focus on understanding that auxins disrupt the growth patterns of broadleaf weeds while not affecting grasses, emphasizing the selective nature of auxins in weed control.

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