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Activity 6.3 — Geotropism in Plants
NCERT Activity 6.3: Place a seedling horizontally and observe how the root bends downward (positive geotropism) and the stem bends upward (negative geotropism).
How To Perform
1
Place Seedling Horizontally
Position a young seedling horizontally to observe its response to gravity.
2
See Gravity's Effect on Auxin
Gravity pulls auxin to the lower side of both root and stem.
3
Watch Root Bend Down
The root bends toward gravity (positive geotropism) — high auxin inhibits root growth.
4
Watch Stem Bend Up
The stem bends against gravity (negative geotropism) — high auxin promotes stem growth.
5
Classify the Response
Understand the mechanism of geotropism.
⚠️ Safety Notes
- •Handle the seedling gently to avoid damaging the delicate roots.
- •Ensure the seedling is kept moist during the experiment.
- •Use a young seedling with a visible root and shoot for best results.