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GCSE Biology · key term
A gaseous plant hormone involved in fruit ripening.
Used by AQA, Edexcel and OCR
Specification 4.5.4.2 · Paper 2
A gaseous plant hormone that controls fruit ripening.
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 6.16B · Paper 2
A gaseous plant hormone used commercially to control fruit ripening.
Revise: Commercial Uses of Plant HormonesThe three hormones required here are auxins, gibberellins and ethene. Each is used for a different set of jobs.
Specification B3.2h · Paper 1 (Foundation), Paper 3 (Higher)
A gaseous plant hormone that promotes processes including fruit ripening, flower opening and leaf shedding.
Revise: Effects of plant hormonesThree important groups are auxins, gibberellins and ethene.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A gaseous plant hormone involved in fruit ripening and the dropping of leaves.
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.
Do not give 3% as a universal ethene concentration. If a graph is provided, select the lowest concentration at which the ripening benefit levels off and justify it using the data and cost.
Use ethene in answers, although some older material may call the same substance ethylene.
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.
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