sciencegcse← Topic extras

Separate Biology · Paper 2 · Higher Tier only · B5

Higher: gibberellins and ethene

Key ideas1 of 3

More than one plant hormone

Auxin is not the only plant hormone. Gibberellins are important in initiating seed germination, when a dormant seed begins to grow under suitable conditions. A hormone helps coordinate the response; it does not replace the water, oxygen and suitable temperature needed for germination. When interpreting an experiment, compare treated seeds with a control kept under the same environmental conditions.

Treatments X and Y are compared with no treatment for germination and fruit mass.

Next: Higher: using plant hormones →
Practice, downloads and sources

Daily 5 · Exam practice · Revision sheet ↓

Higher Tier only · B5. Use alongside the shared B5 lessons.

AQA GCSE Biology 8461 · 4.5.4.1. Original notes, questions and diagrams. Models are simplified; teaching data are illustrative.