Botanically speaking, the sharp defensive structures on a rose stem are not true thorns, but are classified as what?
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In botany, true thorns are modified branches, and spines are modified leaves. The sharp growths on roses are actually 'prickles,' which are extensions of the stem's outer skin. This is why they can be easily snapped off sideways without tearing the deep wood of the plant. Photo: W.carter, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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