Assertion (A): West-flowing rivers of Peninsular India have no deltas. Reason (R): These rivers do not carry any alluvial sediments.

Answer: (c) A is true but R is false.

A is broadly true (they form estuaries); R is false — they carry sediment but lose it to fast flow and tidal currents.

The idea

A delta grows where river deposition at the mouth exceeds removal by waves and tides. An estuary stays open where marine action and channel conditions prevent a large delta from building. A river can therefore carry sediment and still have an estuary.

River erodes and carries sediment → Water reaches the coast → River flow slows → Some sediment settles → Tides and currents redistribute it → Deposition–removal balance shapes the mouth

Why the others are wrong

(a) Accepts R — but the rivers do carry sediment.

(b) Accepts R.

(d) Rejects A — the Narmada and Tapi end in estuaries.

The trap

“Any” in R — the absolute word.

Elimination technique

R says there is no alluvial sediment at all. Rivers such as Narmada transport sediment, so R fails independently of whether a delta forms. That separates (c) from the choices accepting R.

Also know

The Godavari, Krishna and Mahanadi have prominent east-coast deltas. Narmada and Tapi enter the Gulf of Khambhat. Not every west-coast river occupies a rift valley, and small local deposits can occur even at estuarine mouths; avoid treating the broad east–west comparison as a universal rule.