Auxin — How It Works
Part of Plant Hormones · GCSE GCSE Biology revision
This deep dive covers Auxin — How It Works within Plant Hormones for GCSE Biology. Topic 11: Plant Hormones It is section 2 of 12 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 12
Practice
16 questions
Recall
12 flashcards
🔬 Auxin — How It Works
Auxin is a plant hormone that controls growth:
- Made in shoot tips and root tips
- Causes cell elongation (cells grow longer)
- Moves away from light in shoots
- High concentration in shoots = more growth
- High concentration in roots = less growth (roots are more sensitive)
Phototropism explained:
- Light hits shoot from one side
- Auxin moves to shaded side
- Cells on shaded side elongate more
- Shoot bends towards light
Keep building this topic
Read this section alongside the surrounding pages in Plant Hormones. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Plant Hormones
When a plant shoot is lit from one side, where does auxin accumulate?
Explain how auxin causes gravitropism (geotropism) in plant roots.
Quick Recall Flashcards
16 questions on Plant Hormones — practise free
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