Question

Not only the fruit but the leaves of the banana tree is/are also immensely useful

Answer 1

Are is the ans
Not only fruit but the leaves of the banana trees are also immensely useful......☺️

Answer 2

Yes it is true that not only the fruit but their leaves are also used a lot
1. For shelter in rain
2. Used as plates in ceremonies
3 Herbal medicines
Are is the answer