Modified stem of a plant

Modified stem of a plant

The palm tree above has spine shaped thorns, a modification of stems. Thorns are hard structures with hard, pointed ends. They are modifications of the stem and can be simple or branched. The two theories as to why they arose are either they first evolved as a defense mechanism for plants in areas without sufficient resources for quick regeneration of damage caused by animals, or they evolved in resource rich environments where herbivores were very common.

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