The banana plant is not a tree, but a giant herb.
Why it is true
What appears to be a trunk is actually a pseudostem formed by leaf bases, and the plant belongs to the herb family.
Source: Nature
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.