Which landform can Himalayan rivers form in plains?

Correct answer: Meander

The direct answer is A, a meander. In a plain, the river’s slope becomes gentle and its speed is generally lower than in the mountains. The river then swings from side to side, producing broad winding bends called meanders. Reasoning chain: mountain river enters a flat area; gradient decreases; sideways erosion and deposition act on different banks; bends become larger and more curved; the resulting landform is a meander. Option A is correct because meanders are characteristic winding bends of rivers on relatively level land. Option B, a volcanic cone, is built by lava and volcanic material around a volcano, not by ordinary river flow. Option C, a sand dune, is mainly formed by wind depositing sand, so it is not the best answer for a river landform; the word “only” is also unjustified. Option D, a coral reef, is built by marine coral organisms in suitable warm shallow seas, not by Himalayan river action on plains. Remember: a bend in a river is a meander; if the bend is later cut off, it may become an oxbow lake.