OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Plant HormonesAuxins are plant hormones important in controlling tropisms. In a shoot, auxin from the growing tip can become distributed unevenly when light or gravity acts from one direction. Auxin promotes elongation of shoot cells.
- Revise: Uses of Plant Hormones
A group of plant hormones that can stimulate growth and are used in rooting powders and some selective weedkillers.