Question

Why do floating plants have spongy stems

Answer 1

Usually it is because their leaves have some spongy cells full of air. Some of them have spongy stems filled with air. Many also have a water repellent surface, so they don't get soaking wet when they go under the surface. ... Spongy air filled stems appear on the floating water chestnut.

Answer 2

Answer:

Because some cells contain air

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