Phototropism vs Gravitropism — Difference (with Table)
Phototropism vs Gravitropism compared side by side — a 7-row comparison table and 4 key points. Class 11 Biology, free and no sign-up.
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TL;DR: Phototropism vs Gravitropism compared side by side — a 7-row comparison table and 4 key points. Class 11 Biology, free and no sign-up.
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The main difference between Phototropism and Gravitropism: Phototropism and gravitropism are two types of plant tropisms that describe growth responses to different stimuli. Phototropism is growth response to light
Phototropism vs Gravitropism — Comparison Table
| Basis | Phototropism | Gravitropism |
|---|---|---|
| Stimulus | Light direction | Gravitational force |
| Response | Growth toward or away from light | Growth toward or away from gravity |
| Hormone Involved | Auxin distribution by light | Auxin distribution by gravity |
| Positive Response | Growth toward light (stems) | Growth toward ground (roots) |
| Negative Response | Growth away from light (roots) | Growth away from gravity (shoots) |
| Example | Plant bending toward window light | Roots growing downward, stems upward |
| Time for Response | Minutes to hours | Minutes to hours |
Key Points
- Phototropism response to light direction; gravitropism to gravity
- Both involve auxin hormone causing differential cell growth
- Positive phototropism in stems; negative in roots
- Gravitropism keeps roots down and shoots up against gravity