19
Why would someone want to live in or near the flood plains of South Asia?

Agriculture: Floodplains are very fertile agricultural areas. They are usually flat  and have few farming obstacles. This means more crops can be grown and there is more profit for farmers and more food for people.

Transportation: Slow-flowing rivers and flat terrain provide great means of transportation corridors. Ships can haul cargo and are usually more effective than roadways.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.