At first glance, thorns and spines may seem to be the same. However, they are unique structures that are derived from different parts of a plant. In botanical terms, a thorn is a modified stem, whereas a spine is a modified leaf. Both of these structures serve similar purposes. This article delves into the differences between these two plant adaptations.
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| Spines | Thorns |
| Spines are essentially modified leaves | Thorns are fundamentally modified stems |
| Spines usually occupy the same position as leaves | Thorns commonly form in place of buds (in the leaf's axil) |
| Spines' primary function is to provide defense. They also help to prevent excessive transpiration | Thorns are used for defense as well. They also assist in climbing |
| Spines originate exogenously | Thorns originate endogenously |
| Spines are not deeply embedded | Thorns are deeply embedded |
| Example: Cactus | Example: Rose Bush |
Related Links:
- More Differences in Biology
- Understanding the Anatomy of Plants – Parts and Functions
- Morphology of Flowering Plants – Exploring the Structure
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