Thorns vs Spines in Bougainvillea
Thorns and spines are often confused, but they are actually different structures found in plants like Bougainvillea. In the NCERT text, it may mention thorns, but in the diagram, it shows spines. Let's understand the difference between the two:

Thorns:
- Thorns are modified branches or stems that arise from the axils of leaves. They are usually sharp and pointy, serving as a defense mechanism for the plant.
- Thorns are typically found in roses, citrus trees, and hawthorns.

Spines:
- Spines are modified leaves, leaf parts, or stipules that have become hardened and pointed. They also function as a defense mechanism, protecting the plant from herbivores.
- Spines are common in plants like cacti, citrus plants, and Bougainvillea.

Bougainvillea:
- Bougainvillea plants have spines rather than thorns. The sharp structures found on Bougainvillea stems are actually modified leaves that have evolved to protect the plant.
- These spines help deter animals from feeding on the plant and also provide support for climbing.

Conclusion:
In summary, while the NCERT text may mention thorns, the diagram accurately depicts spines on Bougainvillea. Understanding the difference between thorns and spines can help clarify the terminology used to describe plant structures.

Its thorn.