sir/mam can u give 2 reasons to explain that the onion is a modified stem ?plzzzzzzzzzzz answer this question as quick as possible.

The onion consists of reduce disc shaped stem. It is a modified stem as it is present underground and bears fleshy scaly leaves in the form of bulb and small roots in the form of rhizoids.
However onion bulb is a modification of leaves. These leaves are modified to store food.  ‚Äč

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Onion is a bulb and bulb is called a modified stem because it bears leaves and flowers and carris out the function of a stem. Only exception is that it is present below ground and not above ground.

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