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
15 questions
Recall
20 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