Question

what has made the Ganga Brahmaputra basin fertile

Answer 1

Because the river Carrys silt and deposit it in their delta . This silt is very fertile and rich for growth of plants. This silt is also called Aluuvial soil.
When the rivers deposit and large amount of silt near their basin the land becomes fertile and good for agriculture.

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Answer 2

Because the river Carrys silt and deposit it in their delta . This silt is very fertile and rich for growth of plants. This silt is also called Aluuvial soil. When the rivers deposit and large amount of silt near their basin the land becomes fertile and good for agriculture