Mountains and Plateaus of India

The governing concept is the regional division of the Western Ghats into hill groups and associated ranges. The Palani, Annamalai, and Cardamom Hills are located in southern peninsular India and form important hill units associated with the southern Western Ghats. They are known for elevated terrain, steep slopes, forests, and plantation landscapes. Hence option C is correct. The outer Himalayas lie in the far north, the Ganga delta is a low coastal depositional plain, and the Thar dunes are wind-shaped sandy landforms in north-western India. These alternatives describe entirely different physical regions and do not fit the three named southern hill ranges.

Option A is correct. The Western Ghats form a high and generally steep escarpment along the western margin of the Deccan Plateau, close to the Arabian Sea coast. Their western slope is often sharper, while the eastern side descends more gradually into the interior plateau. This relief affects climate because moist south-west monsoon winds rise against the range and produce heavy rainfall on the windward side, with a rain-shadow effect farther east. The Western Ghats are therefore a mountain barrier and plateau edge, not a lagoon, an alluvial plain, or a glacier. The Ganga plain is formed by river deposition, and Himalayan glaciers are high-altitude ice features in a different physical region.

Option C is correct. The Nilgiri and Annamalai hills are important highland groups of southern Peninsular India and are geographically related to the Western and southern Ghats system. The Nilgiris form a major hill junction near the meeting area of the Western and Eastern Ghats, while the Annamalai Hills lie farther south and are connected with the southern Western Ghats. Their location, elevation, forests, and monsoon influence reflect the physical geography of the Peninsular highlands. They are not outer Himalayan ranges, which lie in northern India; they are not Thar dunes, which are arid depositional landforms; and they are not parts of the Ganga delta, a low alluvial region.

Option A is correct. The Pir Panjal and Dhauladhar are prominent ranges of the Lesser Himalaya, also called the Middle Himalaya or Himachal Himalaya. This physiographic belt lies broadly between the higher Himadri, or Greater Himalaya, to the north and the lower Shiwalik ranges to the south. The Pir Panjal is especially important in the Jammu and Kashmir region, while the Dhauladhar is associated with Himachal Pradesh. Their relief is rugged and deeply dissected, with valleys and high passes. The Eastern Ghats, Deccan Trap, and Meghalaya Plateau belong to different parts of India and have different geological and geomorphic settings, so options B, C, and D cannot explain these two Himalayan ranges.

Option B is correct. Godwin Austen is the traditional name associated with K2, the highest peak of the Karakoram range and one of the world's highest mountains. The Karakoram lies in the high mountain belt north of the main Himalayan ranges and is commonly classified within the Trans-Himalayan region. Its landscape is characterised by enormous elevations, sharp peaks, extensive glaciers, and deep valleys, all of which support the identity given in option B. The Southern Ghats are lower peninsular hills, the eastern coastal plain is a low depositional strip beside the Bay of Bengal, and Rajasthan's sandy plain belongs to the Thar Desert. None of these alternatives matches the Karakoram's high glaciated relief.

Kalsubai Peak is widely recognized as the highest peak in Maharashtra, with an elevation of about 1,646 metres. It lies in the Sahyadri, the regional name for the Western Ghats, in the Nashik–Ahmednagar area. Therefore, option A correctly identifies its geographical importance. The other choices describe unrelated landforms: the Aravalli Range is a separate old mountain system, a coastal delta is a depositional feature formed by river sediments, and Ladakh is a high-altitude cold-desert region of the Himalayas. Remembering Kalsubai as “Maharashtra’s highest peak” is the most useful exam association.

The Garo, Khasi, and Jaintia Hills are the principal hill ranges associated with the Meghalaya Plateau in northeastern India. In physical geography, the Meghalaya Plateau is treated as an extension of the Peninsular Plateau, although it is separated from the main peninsular block by the Garo-Rajmahal gap. Thus option A is correct. The Deccan Plateau occupies much of southern and central India, Bundelkhand lies mainly in the northern part of the Peninsular Plateau, and Ladakh Plateau belongs to the high Himalayan region. Grouping the three named hills under Meghalaya Plateau makes the geographical relationship easier to remember.

The Peninsular Plateau is one of India’s oldest geological landmasses. It is built mainly of ancient, hard, crystalline igneous and metamorphic rocks that have remained comparatively stable for a very long period. Its broad uplands, residual hills and mineral-rich areas reflect this old geological foundation. Therefore, option A gives the correct reason. The Ganga Plain is a much younger depositional surface made largely of river-borne alluvium; a coral reef is a marine biological formation, and complete glacial cover is characteristic of neither the Peninsular Plateau nor most of India. The Himalayas, in contrast, are geologically younger and tectonically active fold mountains.