GCSE Biology (AQA)

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Auxin

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Homeostasis and Response Plant Hormones

Auxin

2:03 Control and Coordination in Plants
Spec 4.5.4.1
Previous Plant Tropisms Next Phototropism
  • Plants use chemical messengers called hormones, similar to humans.
  • Auxins are a family of hormones that coordinate growth at the tips of shoots and roots.
  • Auxins are often referred to in the singular form as "orin."
  • Auxins are primarily produced in the tips of growing shoots and roots and diffuse to other parts of the plant.
  • Auxins coordinate plant growth by altering the rate at which plant cells elongate.
  • More auxin leads to faster growth or more elongation of plant cells.
  • Auxins help plants grow in specific directions by uneven distribution within plant cells.
  • If more auxin is present on one side of a plant, it causes the plant to curve towards the opposite side.
  • Stems and roots react differently to high concentrations of auxin; stems grow more while roots grow less.
  • Understanding the different responses to auxin in stems and roots is crucial for learning about various plant tropisms.

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