Thorns

Definition

Thorns are modified stems that protect plants from herbivores. They are typically hard, pointed, and can vary in size and shape among different plant species.

5 Must Know Facts For Your Next Test

1. Thorns are a type of defense mechanism in plants.
2. Unlike spines or prickles, thorns originate from shoots or branches.
3. Thorns can be found in various plant families, including the Rosaceae and Fabaceae.
4. They often develop at nodes where leaves attach to the stem.
5. Thorns can also help reduce water loss by limiting the surface area exposed to air.

Review Questions

• What is the primary function of thorns?
• How do thorns differ from spines and prickles?
• Name two plant families where thorns are commonly found.

Related terms

Spines:

Modified leaves that serve as a protective adaptation against herbivores.

Prickles: Outgrowths from the epidermis or cortex of a plant, often mistaken for thorns but structurally different.

Nodes:

Points on a stem where leaves or branches originate, often associated with thorn development.