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GCSE Biology · key term
A group of plant hormones involved in processes including breaking seed dormancy, germination and flowering.
Used by AQA and OCR
Specification 4.5.4.2 · Paper 2
A group of plant hormones that can end seed dormancy, promote flowering and increase fruit size.
Revise: Plant Hormone UsesPeople can also apply plant hormones to control when or how plants grow. This is useful in agriculture, where crops are produced, and horticulture, where plants such as flowers, fruit and garden plants are grown. This Biology-only, higher-tier topic focuses on three groups: auxins, ethene and gibberellins.
Specification B3.2h · Paper 1 (Foundation), Paper 3 (Higher)
Link each hormone to a named effect rather than writing only that it ‘controls growth’: auxins promote cell enlargement, gibberellins promote germination and stem growth, and ethene promotes fruit ripening.
For each effect, name the hormone and then state the plant response: for example, gibberellins → breaking seed dormancy and germination; ethene → fruit ripening.
This B4.4 content is separate science only, and the outcome on gibberellins and ethene is shown in bold in the OCR specification, so it is assessed at Higher Tier.
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A group of plant hormones involved in processes including stem elongation, the ending of seed dormancy, germination and flowering.
Three important groups are auxins, gibberellins and ethene.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Gibberellins and EtheneTwo important examples are gibberellins, which are a group of related hormones, and ethene, which is a gas. They control different parts of the plant life cycle.
A group of plant hormones that can stimulate seed germination, flowering and fruit growth.