Correct Answer: Option A) 1 & 2 only
The Narmada and Tapti rivers both flow in rift valleys: True
Both the Narmada and Tapti rivers in central India flow through rift valleys formed by tectonic activities. These are fault-guided valleys created by the sinking of land between parallel faults, not by the river's erosional activity.
Rivers in rift valleys usually have steep banks and limited meandering: True
Rift valleys have steep sides due to their tectonic origin. Rivers flowing through such valleys typically have steep banks and follow a relatively straight course dictated by the fault lines, limiting their ability to meander freely.
Such valleys are commonly formed by fluvial erosion: False
This is incorrect. Rift valleys are formed primarily by tectonic forces (faulting) where land between two parallel faults sinks down, creating a graben structure. They are not formed by the erosional action of rivers (fluvial erosion). Normal river valleys, in contrast, are formed by fluvial erosion over time.
Therefore, only statements 1 and 2 are correct, making Option A the right answer.
