What are thorns in woody plants?

Thorns in woody plants are indeed modified stems that typically develop in the axils of leaves. Their primary purpose is often protective; they serve to deter herbivores and provide defense against browsing animals. By evolving into sharp structures, thorns allow the plant to reduce the likelihood of being eaten, which can enhance the chances of survival and reproduction.

Thorns can vary widely in appearance and size among different plant species, and while they may superficially resemble spikes or prickles, they are fundamentally different. Their origin from stem tissue, rather than leaf or root, distinguishes them clearly as modified branches, formed through the plant's growth processes.

In contrast, other choices describe different plant structures. For example, roots are essential for nutrient absorption but do not evolve into thorns, while leaf-like structures are modified for photosynthesis rather than defense. Reproductive structures are involved in the plant's life cycle, enabling propagation, but they do not contribute to the protective function that thorns serve. Understanding these distinctions helps clarify the role of each plant structure within the broader context of plant adaptations and survival strategies.