Physical Features of India

Antecedent rivers keep cutting their old course even after mountain building. For exams remember deep gorges of Indus and Brahmaputra.

Young fold mountains are geologically more active. For exams link the Himalayas with seismic zones.

The direct answer is A. The Himadri, or Greater Himalaya, contains high snowfields and glaciers. Glaciers store snow and ice and release meltwater, especially during warmer seasons. This meltwater joins streams and helps many Himalayan rivers continue flowing through much of the year, so they are called perennial or relatively perennial rivers. Option A is correct because it describes the glacier-to-river water supply. Option B is wrong because glaciers do not make all rivers underground. Option C is wrong because rivers do not become coral islands; coral reefs are built by marine organisms in suitable warm, shallow seas. Option D is wrong because Himalayan rivers do not generally end in deserts merely because glaciers exist; many flow to the plains and seas. The statement says “many,” not every river, which makes it scientifically suitable. Memory cue: Himalayan glaciers act as natural water stores.

The loose sedimentary structure of Shiwalik can make slopes unstable. For exams remember Shiwalik as Outer Himalaya.

Dun valleys are long, narrow structural valleys found between Himalayan mountain ranges. In the usual Indian geography description, they occur between the Shiwalik range and the Lesser Himalaya. Rivers and streams bring and deposit sediments in these enclosed spaces, so the valleys have a notable sedimentary or alluvial character. Dehradun is a well-known example. This combination of a long valley, mountain boundaries, and deposited sediment distinguishes a Dun valley from an ordinary open river plain. Therefore, option B is correct.

The other choices refer to unrelated landforms. Sea waves can shape coastal features, coral forms islands, and moving sand creates Thar dunes, but none of these explains the Himalayan Dun structure. The word “between” is especially important: Dun valleys are not simply flat plains anywhere beside a river; they are elongated basins lying between mountain ranges. Thus the relief setting and sediment accumulation together lead to option B.

The direct answer is A. Bhabar contains coarse, porous pebbles and sediments at the foothills, so streams often sink into the ground. Farther south, the Terai has finer, less porous material; the underground water reappears near the surface, making the land wet and marshy. Thus the exact sequence is: Bhabar—water disappears underground; Terai—water comes back near the surface. B is impossible because tides and coral belong to coastal marine environments, not these Himalayan foothill belts. C is wrong because glaciers and lava do not describe the normal Bhabar–Terai contrast. D is wrong because Terai is often wet, not completely dry. Memory cue: “Bhabar absorbs, Terai returns.”

Near surface water and high moisture in Terai support vegetation. For exams remember Terai as a moist foothill belt.

In flat plains river velocity decreases and deposition increases. For exams link river landforms with plains.

Bhangar is older alluvium deposited earlier by rivers and is generally found on relatively higher parts of the floodplain. Khadar is newer alluvium deposited repeatedly in the lower floodplain near rivers and is considered more fertile. Option A reverses these features. Exam tip: remember Bhangar as ‘old-higher’ and Khadar as ‘new-lower’.

The direct answer is A, alluvial soil between two rivers. A doab is the land lying between two rivers; the word can be understood as “two waters.” Rivers deposit fine silt, sand and clay on their floodplains, forming fertile alluvial soil. With water availability and fertile deposits, doabs are especially useful for farming. The reasoning is: two rivers enclose the area; repeated deposition creates alluvium; fertile soil and water support crops. Option A is correct. Option B, a thick layer of sea salt, would make soil saline and generally harm many crops; a doab is not defined by the sea. Option C, permanent snow cover, occurs in very cold high mountains and prevents ordinary cultivation, so it does not describe doabs. Option D, uplift of coral rocks, relates to some coastal or island landforms, not the river-deposited plains between two rivers. The Ganga–Yamuna Doab is the familiar Indian example, located between the Ganga and Yamuna. Memory cue: doab means do (two) plus ab (water), therefore land between two rivers.

High water and silt in Brahmaputra can cause channel shifting. For exams remember the Assam Valley.

In a delta silt deposition divides the river into distributaries. For exams remember deposition and distributary.

Sundarbans is a saline tidal mangrove area of Ganga Brahmaputra Delta. For exams remember mangrove and delta together.

The Peninsular Plateau is a stable landmass made of ancient hard rocks. For exams remember it as older than the Himalayas.

The slope of Central Highlands directs several rivers toward the Ganga Yamuna system. For exams remember Chambal Betwa Ken.

Narmada Valley between Vindhya and Satpura shows a rift valley route. For exams see this sequence on a map.

The eastward slope of the Deccan Plateau sends many large rivers toward Bay of Bengal. For exams study slope with river direction.

Layers of basaltic lava create step like landforms in Deccan Trap. For exams link Trap with steps.

The direct answer is A, shrink-and-swell nature. Black soil contains a large amount of clay, especially clay that expands when wet and contracts when dry. Step by step: water enters the clay particles; the soil swells and holds moisture; drying removes water; the particles contract and wide cracks may form. Therefore water retention and cracking are two results of the same property. B, coral hardness, concerns marine organisms and does not explain soil behaviour. C, glacial accumulation, concerns deposits made by glaciers. D, tidal drainage, concerns coastal water movement. A is correct. This soil is common in the Deccan region and is valuable for cotton, but those facts are examples or associations, not the property itself. Exam cue: black soil = clay + moisture retention + shrinkage cracks.

Mineral resources of Chotanagpur provide a base for heavy industries. For exams remember the mineral and industry link.

The direct answer is A. The Meghalaya Plateau is regarded as a northeastern extension of the Peninsular Plateau, but it appears physically separated from the main block because the Ganga–Brahmaputra plains lie between them. In other words, geological and regional classification can show a connection, while the intervening low plain makes the plateau look separate on a map. Option A is correct. Option B is wrong because the Thar Desert lies in western India, not between the Peninsular Plateau and Meghalaya. Option C is wrong because the Arabian Sea is west of the peninsula and cannot explain the separation in northeast India. Option D is wrong because Lakshadweep is an island group in the Arabian Sea and is unrelated to this land connection. The Meghalaya Plateau includes the Garo, Khasi and Jaintia hills and is separated from the Chotanagpur-related plateau region by the broad alluvial plains. Memory cue: Meghalaya is a plateau extension, but plains make it look detached.

Direct answer: Option A, low height and intense erosion. A very old mountain range has been exposed to weathering and erosion for a long geological period. Erosion wears down slopes and peaks, so an ancient range generally has lower, more rounded, and less rugged relief than a young, actively rising range. The Aravalli Range is among India’s oldest fold mountain systems and has been greatly denuded. Option A is therefore the correct geomorphic clue. Option B is wrong because permanent glaciers require sufficiently high, cold peaks and do not by themselves indicate that a range is ancient. Option C is wrong because a tidal delta forms from sediment deposition at a coast, not from mountain age. Option D is wrong because a marine coral ring is a reef feature, unrelated to an eroded mountain range. Memory cue: old mountains are worn down; young mountains are usually higher and sharper.

Moist winds rise over the Ghats and a rain shadow forms on the other side. For exams remember Western Ghats and monsoon link.

Rivers like Mahanadi Godavari Krishna and Kaveri cut across Eastern Ghats. For exams remember Eastern Ghats as discontinuous.

Nilgiri is linked with the contact zone of Western and Eastern Ghats in South India. For exams locate it on the map.