Swollen spongy petiole is present in

Hydrilla

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Eichhornia

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Ruppia

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Pistia

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Solution

The correct option is B Eichhornia
Eichhornia is a free-floating aquatic plant. The petiole bears a large membranous stipule, which forms a sheath around the next younger leaf. Petioles are spongy and form a bulbous float containing air-filled lacunate tissue.
Therefore, the correct answer is option B.

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