The banana don't have a woody stem; what we see as the "trunk" is actually a pseudostem formed by layers of stacked leaf sheaths. The real stem is the bulb buried underground. The banana "trunk" looks very tall, but it's actually very flexible and can be easily cut with a knife. Once cut, you'll find that it unfolds layer by layer, like an onion.
The upright posture of banana plants is primarily due to intracellular turgor pressure, rather than relying on rigid fibrous tissue like that of woody plants. While the stems of true woody plants thicken year by year, the pseudostem of a banana plant is cut off after fruiting, while the true stem remains underground and continuously produces new offshoots.

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