Geography Set 11 | MROY Class

Geography Set 11 Questions & Answers

The Rialo Series of the Dharwar System, also known as the Delhi series, extends from Delhi to Alwar in Rajasthan. It is highly renowned for yielding which high-quality building material located in Makrana and Bhagwanpur? – High-quality Marble
Which Dharwarian rock series stretches over the Jabalpur and Rewa districts and is exceptionally rich in mica, dolomite, schist, and marble of superior quality? – Sakoli Series
The Sausar Series, belonging to the Dharwarian group and spreading over the Nagpur, Bhandara, and Chhindwara districts, is predominantly rich in quartzite, mica schist, marble, and which other type of rocks? – Manganiferous rocks
The Cuddapah System rocks are primarily sedimentary-metamorphic. Where do these formations prominently occur in the extra-Peninsular region of India? – The Lesser Himalayas
The enormous thickness of the Cuddapah formations indicates the sinking of the basin beds under growing sedimentation. At certain places, the thickness of these rocks reaches up to: – 6,000 metres
The Bijawar Series, belonging to the Vindhyan System and stretching over the Chhatarpur and Panna districts, is famous for having basaltic intrusions whose dykes are rich in which precious stones? – Diamonds
The Kaimur Series of the Vindhyan formation sprawls over Bundelkhand and Baghelkhand. It is rich in which specific stone utilized prominently in Indian historical monuments? – Red Sandstone
The Gondwana group of rocks begins with the Permo-Carboniferous period. In the Standard Geologic Time Scale, this period is globally renowned as a period of: – Coal formation
Which series represents the youngest part of the Lower Gondwana System, derives its name from a hill south of Raniganj, and is notably devoid of coal-seams? – Panchet Series
The Deccan lava plateau has a maximum thickness of about 3,000 metres along the coast of Mumbai, but its thickness decreases steadily towards the east and south. What is its measured thickness at Amarkantak? – 150 metres
The Pampore and Pulwama Karewas in the Kashmir Valley are lacustrine deposits formed during the Pleistocene period. They are particularly famous for the cultivation of: – Saffron, almond, and walnut
The Aravalli range in Peninsular India is one of the oldest folded mountains of the world. To the northwest of Udaipur, the Aravallis are locally referred to as: – Jarga Hills
The Malwa Plateau features two distinct drainage systems. While the Narmada and Mahi flow towards the Arabian Sea, which group of rivers flows towards the Bay of Bengal to join the Yamuna River? – Chambal, Sind, Betwa, and Ken
The Bundelkhand Plateau (Vindhyachal Plateau) is characterized by senile topography. Which rivers have carved out steep gorges, rapids, and waterfalls across this region? – Betwa, Dhasan, and Ken
The highest elevation of the Meghalaya Plateau is the Shillong Peak (1,823 m). Which peak stands as the highest point of the nearby Garo Hills? – Nokrek
The Dandakaranya region sprawls over parts of Orissa, Chhattisgarh, and Andhra Pradesh, featuring rich iron-ore deposits in the Bailadila Range. This undulating plateau is primarily drained by the Tel, Udanti, Sabari, and Sileru rivers, which are tributaries of which major river system? – Mahanadi and Godavari rivers
The highest peak of the Baba-Budan Hills is Mullayanagiri (1,930 metres). This peak is geographically located within which plateau of the South Deccan? – Karnataka Plateau
The Nandi valley is noted as a famous summer resort located in the southern part (Maidan) of which physiographic region? – Karnataka Plateau
What is the geographical gap, approximately 24 km wide, that separates the Tamil Nadu Uplands and the Nilgiris from the southern coast of Kerala, allowing the Gayitri river to flow through from east to west? – Palakkad Gap (Palghat)
The Western Ghats (Sahyadris) form a watershed for the peninsula, running parallel to the western coast for about 1,600 km. The average elevation of the Western Ghats varies between: – 1000 to 1300 metres
Situated at about 1,200 metres above sea level, which mountain pass lying south of Mount Abu directly connects the city of Udaipur with Sirohi and Jalore in Rajasthan? – Goran Ghat
The Eastern Ghats consist of detached hills of heterogeneous composition. Between the Mahanadi and Godavari rivers, the average elevation of the Eastern Ghats is approximately: – 1100 metres
The Indian Himalayas form a massive mountain barrier extending from the eastern boundary of Pakistan to the border of Myanmar. What is their approximate length and varying width? – 2500 km long; width varies from 500 km in the west to 320 km in the east
According to Plate Tectonics theory, the massive continent-to-continent collision between the Indian plate and the Asiatic plate began approximately: – 65 million years ago
The Shiwaliks, characterized by a thick sequence of terrestrial sediments formed in the foredeep, cover a continuous geological span of approximately: – 14 million years
The Trans-Himalayas contain Tethys marine sediments and fossils underlain by Tertiary granite. What is the approximate width of this physical division? – 40 km
Which major tectonic fault line, located at the present boundary separating the Shiwaliks from the Northern Plains of India, remains quite active and records frequent tremors and earthquakes? – Himalayan Front Fault (HFF)
Based on the longitudinal divisions of the Himalayas by Prof. S.P. Chatterjee (1973), the Kumaun Himalayas stretch over a length of 320 km. Which two rivers demarcate the natural boundaries of the Kumaun Himalayas? – Satluj and Kali rivers
The Central Himalayas stretch for about 800 km and occupy an area of roughly 116,800 sq km. A major part of this massive division lies in which neighboring country? – Nepal
Situated at an elevation of 5,270 metres, which high mountain pass in the Greater Himalayas connects the Kullu and Spiti districts of Himachal Pradesh, offering an easier alternative to the traditional Pin-Parbati Pass route? – Debsa Pass

MROY Class

Geography Set 11

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📌 Geography • Rock Systems

Q.1) The Rialo Series of the Dharwar System, also known as the Delhi series, extends from Delhi to Alwar in Rajasthan. It is highly renowned for yielding which high-quality building material located in Makrana and Bhagwanpur?

Ans > High-quality Marble

Explanation: The Rialo Series (Delhi series) extends from Delhi to Alwar in Rajasthan in a north-east to south-west direction. This series is rich in marbles, and the Makrana and Bhagwanpur regions, known for their high quality of marble, belong to this series.
Geological Significance of the Dharwar System: The Dharwar rock system represents some of the oldest metamorphosed sedimentary rocks on Earth, dating back roughly 2.5 to 1.8 billion years. Formed during the Archean and Proterozoic eons, these formations are pivotal for India’s mineral wealth. The Rialo or Delhi series is an integral part of this structural framework, extending primarily through Rajasthan.
The Architecture of Makrana Marble: The Makrana marble extracted from this series is globally celebrated for its high calcium content and incredible resistance to water seepage. Historically, this specific marble was chosen by the Mughal Emperor Shah Jahan to construct the iconic Taj Mahal, as well as the Victoria Memorial in Kolkata.
Tectonic Evolution of the Aravalli-Delhi Belt: Geologically, the region represents an ancient tectonic orogeny where immense heat and pressure transformed primitive limestone deposits into this sparkling, pure white crystalline marble, creating a resource that continues to drive Rajasthan’s mining economy today.

📌 Geography • Rock Systems

Q.2) Which Dharwarian rock series stretches over the Jabalpur and Rewa districts and is exceptionally rich in mica, dolomite, schist, and marble of superior quality?

Ans > Sakoli Series

Explanation: Stretching over the Jabalpur and Rewa districts, the Sakoli series belongs to the Dharwarian formation. It is rich in mica, dolomite, schist, and marble, with the marble of this series being of superior quality.
Geographic Distribution of the Sakoli Group: The Sakoli rock series is a crucial component of the Peninsular Indian shield, predominantly located in the central Indian tectonic zone. While classically associated with areas around Jabalpur and the surrounding central plateau, its core geological footprint lies in the Nagpur and Bhandara districts.
Mineralogy and Economic Value: These Precambrian rocks have undergone intense regional metamorphism, leading to the creation of valuable economic minerals. The mica extracted from these schists has historically been used in the electrical and electronics industries due to its excellent insulating properties.
The Dharwarian Stratigraphy: The dolomite and superior quality marble found in the Bhedaghat region near Jabalpur are a direct product of these ancient geological processes. The Narmada River cuts through these Sakoli-associated marble rocks, creating spectacular gorges that are now a major geographic landmark and tourist attraction, highlighting the enduring physical legacy of the Dharwarian formations.

📌 Geography • Rock Systems

Q.3) The Sausar Series, belonging to the Dharwarian group and spreading over the Nagpur, Bhandara, and Chhindwara districts, is predominantly rich in quartzite, mica schist, marble, and which other type of rocks?

Ans > Manganiferous rocks

Explanation: The Sausar Series spreads over the Nagpur and Bhandara districts of Maharashtra and the Chhindwara district of Madhya Pradesh. It belongs to the Dharwarian group and is rich in quartzite, mica schist, marble, and manganiferous rocks.
The Manganese Belt of Central India: The Sausar rock series forms one of the most economically significant geological belts in Central India, sprawling across the Maharashtra and Madhya Pradesh border. This Precambrian metasedimentary sequence is most famous for housing some of the world’s largest and highest-grade manganese ore deposits.
Geological Formation of Gondite: Geologists refer to these specialized manganiferous rocks as “gondite,” which consists of spessartine garnet and quartz. The formation of these deposits occurred billions of years ago when manganese-rich sediments were deposited in ancient ocean basins and later subjected to extreme tectonic pressure and folding.
Industrial Importance of the Sausar Group: Today, this manganese is a critical raw material for the Indian steel industry, used as an alloying element to increase the strength and hardness of steel. The extensive mining of the Sausar series in districts like Balaghat and Chhindwara has historically formed the backbone of regional industrial development.

📌 Geography • Rock Systems

Q.4) The Cuddapah System rocks are primarily sedimentary-metamorphic. Where do these formations prominently occur in the extra-Peninsular region of India?

Ans > The Lesser Himalayas

Explanation: The Cuddapah System occurs in several areas, including the Cuddapah and Kurnool districts of Andhra Pradesh, Chhattisgarh, and Rajasthan-Delhi. In the extra-Peninsular region, these formations are found in the Lesser Himalayas.
The Proterozoic Sedimentary Basins: The Cuddapah rock system derives its name from the Cuddapah district in Andhra Pradesh, where it forms a massive crescent-shaped basin. Formed during the Proterozoic eon, these rocks were deposited between 1.4 billion and 600 million years ago.
Tectonic Uplift into the Himalayas: While they are a defining feature of the stable Peninsular shield, remnants of similar geological age and composition were caught in the massive tectonic upheaval that formed the Himalayas. Consequently, these ancient sedimentary-metamorphic rocks were pushed up and folded into the Lesser Himalayas (also known as the Himachal or Middle Himalayas).
Lithological Characteristics: This complex tectonic history explains why rocks typical of ancient stable plateaus are found at high altitudes today. The Cuddapah rocks are primarily composed of quartzites, slates, and limestones, making them generally devoid of metalliferous ores but highly valuable for construction materials and cement manufacturing across India.

📌 Geography • Rock Systems

Q.5) The enormous thickness of the Cuddapah formations indicates the sinking of the basin beds under growing sedimentation. At certain places, the thickness of these rocks reaches up to:

Ans > 6,000 metres

Explanation: At places, the Cuddapah formations are six thousand metres in thickness. This enormous thickness indicates the sinking of the beds of the basin with growing sedimentation.
The Concept of Basin Subsidence: In geological terms, sedimentary basins are large depressions in the Earth’s crust where vast quantities of sediment accumulate over millions of years. The Cuddapah basin is a prime example of an intracratonic basin formed on the stable Indian continental crust.
Sedimentary Accumulation Over Millennia: The staggering thickness of the Cuddapah formations, reaching up to 6,000 metres (or 6 kilometers) in certain zones, provides profound evidence of continuous basin subsidence. As rivers and shallow seas deposited sand, silt, and calcium carbonate into the basin, the sheer weight of these accumulating layers caused the underlying crust to slowly sink, allowing even more sediment to pile on top.
Structural Integrity of the Cuddapah Supergroup: Over eons, extreme lithification turned these sediments into the rigid sandstone, shale, and limestone we see today. This incredible thickness makes the Cuddapah series a major geological laboratory for scientists studying the ancient Earth’s surface dynamics.

📌 Geography • Rock Systems

Q.6) The Bijawar Series, belonging to the Vindhyan System and stretching over the Chhatarpur and Panna districts, is famous for having basaltic intrusions whose dykes are rich in which precious stones?

Ans > Diamonds

Explanation: Stretching over the districts of Chhatarpur and Panna, the Bijawar series belongs to the Vindhyan system. It is composed of sandstone, red-sandstone, and quartzite, and it has basaltic intrusions whose dykes are rich in diamonds.
Intrusive Volcanism and Diamond Formation: The Bijawar rock series represents a fascinating epoch in India’s geological history, primarily known for its association with the Vindhyan rock system in Central India. The series is globally renowned because it hosts kimberlite and lamproite volcanic pipes, which are deep-seated basaltic intrusions that originated from the Earth’s mantle.
The Panna Diamond Belt: These extreme pressure and temperature environments are the exact conditions required for carbon to crystallize into diamonds. As volcanic magma rapidly ascended to the surface millions of years ago, it brought these diamonds along with it, depositing them in the dykes and conglomerates of the Panna and Chhatarpur districts in Madhya Pradesh.
Geological Composition of the Bijawar Series: Today, the Panna diamond mines remain the most prominent active diamond mining zone in India. Beyond diamonds, the Bijawar series is characterized by tough quartzites, red sandstones, and hornstone breccia, reflecting a turbulent geological past.

📌 Geography • Rock Systems

Q.7) The Kaimur Series of the Vindhyan formation sprawls over Bundelkhand and Baghelkhand. It is rich in which specific stone utilized prominently in Indian historical monuments?

Ans > Red Sandstone

Explanation: The Kaimur Series sprawls over Bundelkhand (U.P.) and Baghelkhand (M.P.). The main rocks in this series are sandstone, conglomerate, and shale, and it is rich in the red sandstone used in historical monuments.
Architectural Heritage and Vindhyan Rocks: The Kaimur series forms the lowermost division of the Upper Vindhyan geological system, dominating the landscape of Bundelkhand in Uttar Pradesh and Baghelkhand in Madhya Pradesh. This series is predominantly composed of fine-grained, massive red sandstone, shale, and conglomerate.
The Stratigraphy of the Kaimur Range: The distinct red coloration of the sandstone is due to the presence of iron oxide (hematite) within the rock matrix. Because of its incredible durability, uniform texture, and ease of carving, Kaimur red sandstone became the foundational building material for India’s most magnificent medieval and ancient architecture.
Sedimentary Deposition Environments: The Red Fort in Delhi, the Agra Fort, the ancient stupas at Sanchi, and the majestic city of Fatehpur Sikri were all constructed using this exact geological resource. Furthermore, the Kaimur ranges act as a vital watershed, effectively separating the Son River valley from the Ganges drainage basin.

📌 Geography • Rock Systems

Q.8) The Gondwana group of rocks begins with the Permo-Carboniferous period. In the Standard Geologic Time Scale, this period is globally renowned as a period of:

Ans > Coal formation

Explanation: The Gondwana group begins with the Permo-Carboniferous period, which, in the Standard Geologic Time Scale, is known as a period of coal formation.
The Paleoclimate of the Permo-Carboniferous Period: The Permo-Carboniferous period, occurring roughly 300 to 250 million years ago, was a transformative era for the Earth’s biosphere and geology. During this time, India was attached to the massive southern supercontinent known as Gondwana (which also included Africa, South America, Australia, and Antarctica).
Formation of Indian Coal Reserves: The climate was characterized by extensive swamps and dense, lush forests dominated by ancient ferns like Glossopteris. As these vast forests died and were buried under heavy layers of sediment in slowly subsiding tectonic troughs, extreme heat and pressure over millions of years triggered the process of carbonization.
Continental Drift and the Gondwana Supercontinent: This organic transformation converted plant matter into peat, then lignite, and finally into the rich bituminous coal deposits we rely on today. Almost 98% of India’s commercial coal reserves belong to the Gondwana rock system, fueling the nation’s thermal power plants and heavy industries.

📌 Geography • Rock Systems

Q.9) Which series represents the youngest part of the Lower Gondwana System, derives its name from a hill south of Raniganj, and is notably devoid of coal-seams?

Ans > Panchet Series

Explanation: The Panchet Series is the youngest series of the Lower Gondwana System. It derives its name from the hill of that name south of Raniganj, consists of greenish-sandstone and shales, and is devoid of coal-seams.
Stratigraphic Position of the Panchet Group: The Panchet series holds a unique position in Indian stratigraphy as the uppermost and youngest division of the Lower Gondwana rock sequence, dating primarily to the early Triassic period. It is geographically named after the Panchet Hill located south of the Raniganj coalfield in West Bengal.
The Shift in Paleoenvironments: Unlike the older Damuda and Barakar series beneath it, the Panchet series is entirely devoid of coal seams. This lack of coal signifies a dramatic shift in the ancient global climate, transitioning from the humid, swampy conditions that favored thick vegetation to a much drier, semi-arid environment where massive forests could no longer thrive.
Paleontological Discoveries in the Raniganj Coalfields: Instead of coal, the Panchet rocks consist of micaceous, greenish sandstones and red clays. Notably, these sedimentary beds have yielded incredible fossilized remains of ancient amphibians and early reptiles (such as Lystrosaurus), providing vital evidence for continental drift.

📌 Geography • Physiography

Q.10) The Deccan lava plateau has a maximum thickness of about 3,000 metres along the coast of Mumbai, but its thickness decreases steadily towards the east and south. What is its measured thickness at Amarkantak?

Ans > 150 metres

Explanation: The lava plateau of India has a maximum thickness of about 3,000 m along the coast of Mumbai. It decreases towards the south and east, measuring about 800 m in Kachchh, 150 m at Amarkantak, and 60 m at Belgaum.
The Extent of the Deccan Traps: The Deccan Trap is one of the largest volcanic provinces on the planet, formed by massive fissure eruptions at the end of the Cretaceous period, roughly 66 million years ago. As India drifted over the intense Reunion volcanic hotspot in the Indian Ocean, highly fluid basaltic magma flooded the landscape.
Fissure Eruptions and Lava Flows: The eruptions occurred in successive pulses, creating a tiered, step-like topography (the term “trap” is derived from a Scandinavian word for stairs). Near the eruption epicenters along the Western Ghats and the Mumbai coast, the accumulated lava layers reach an astonishing maximum thickness of nearly 3,000 meters.
Topographic Variations Across the Peninsula: However, as the lava spread eastwards and southwards across the peninsular shield, it gradually thinned out. By the time the geological formation reaches Amarkantak in eastern Madhya Pradesh, the basalt layer is reduced to about 150 meters, overlying older ancient rocks.

📌 Geography • Physiography

Q.11) The Pampore and Pulwama Karewas in the Kashmir Valley are lacustrine deposits formed during the Pleistocene period. They are particularly famous for the cultivation of:

Ans > Saffron, almond, and walnut

Explanation: The Karewas are lacustrine deposits consisting of sand, clay, loam, silt, and boulders. The Pampore and Pulwama Karewas are well known for the cultivation of saffron, almond, and walnut.
Glacial and Lacustrine Origins: Karewas are highly unique geological formations found exclusively in the Kashmir Valley, originating during the Pleistocene epoch. These elevated tablelands are essentially the dried-up beds of ancient, massive lakes that existed when the Pir Panjal range was undergoing tectonic uplift, temporarily blocking the natural drainage of the valley.
The Economics of Kashmiri Saffron: Over thousands of years, layers of sand, clay, silt, glacial boulders, and organic mud accumulated in these tranquil waters. When the water eventually drained out through the Baramulla gorge, it left behind highly fertile terrace deposits.
Stratigraphy of the Kashmir Valley: The Karewas of Pampore and Pulwama are globally celebrated because their specific loamy soil composition and moisture-retaining properties are perfectly suited for growing Crocus sativus, the flower that yields saffron (Zafran). Besides this incredibly expensive spice, these nutrient-rich lacustrine deposits are also prime real estate for cultivating high-quality almonds, walnuts, and apples.

📌 Geography • Physiography

Q.12) The Aravalli range in Peninsular India is one of the oldest folded mountains of the world. To the northwest of Udaipur, the Aravallis are locally referred to as:

Ans > Jarga Hills

Explanation: Northwest of Udaipur, the Aravallis are called Jarga Hills (1,431 m). The Aravallis are composed of quartzites, gneisses, and schists of the Precambrian period.
Relicts of an Ancient Mountain Building Event: The Aravalli Range holds the distinction of being one of the oldest fold mountain systems in the world, having formed during the Precambrian era over 1.5 billion years ago. Originally, these mountains were massive and rivaled the modern Himalayas in height.
Local Topography and Nomenclature: However, hundreds of millions of years of continuous weathering and erosion have reduced them to a series of relic or residual hills stretching from Gujarat, through Rajasthan, and up to Delhi. In the southern stretches near Udaipur, the local elevation increases, and the peaks are locally known as the Jarga Hills.
Geological Composition: Reaching altitudes of over 1,400 meters, this section of the Aravallis provides a cooler microclimate compared to the surrounding arid plains. The rocks here are predominantly tough quartzites, gneisses, and schists, which have resisted erosion and currently host significant mineral wealth, including zinc, lead, and silver deposits.

📌 Geography • Physiography

Q.13) The Malwa Plateau features two distinct drainage systems. While the Narmada and Mahi flow towards the Arabian Sea, which group of rivers flows towards the Bay of Bengal to join the Yamuna River?

Ans > Chambal, Sind, Betwa, and Ken

Explanation: The Malwa Plateau has two drainage systems: one towards the Arabian Sea (Narmada and Mahi), and another towards the Bay of Bengal, which includes the Chambal, Sind, Betwa, and Ken joining the Yamuna river.
The Central Highland Water Divide: The Malwa Plateau acts as a critical watershed in the geography of central India, effectively splitting its drainage into two completely separate oceanic destinations. The geological tilt and the presence of the Vindhyan range determine the flow of water here.
River Basin Geomorphology: The southern slopes of the plateau drain into the Narmada and Mahi rivers, which carve their way westward into the Arabian Sea. Conversely, the gentle northern slope dictates the path of the Chambal, Sind, Betwa, and Ken rivers. These rivers flow northeastward, eventually merging into the Yamuna River, which then joins the Ganga and empties into the Bay of Bengal.
The Chambal Badlands: The Chambal River, in particular, has aggressively eroded the soft alluvial and sedimentary edges of the Malwa plateau, creating the famous ravines or “badlands” topography—a heavily gullied landscape historically infamous for harboring outlaws and bandits.

📌 Geography • Physiography

Q.14) The Bundelkhand Plateau (Vindhyachal Plateau) is characterized by senile topography. Which rivers have carved out steep gorges, rapids, and waterfalls across this region?

Ans > Betwa, Dhasan, and Ken

Explanation: The Bundelkhand region is characterized by senile topography where rivers like Betwa, Dhasan, and Ken have carved out steep gorges, rapids, cataracts, and waterfalls.
Characteristics of Senile Topography: The Bundelkhand Plateau, stretching across parts of Uttar Pradesh and Madhya Pradesh, is a classic example of “senile topography.” In geomorphology, a senile landscape is one that has been subjected to millions of years of uninterrupted erosion, reducing ancient mountains to a relatively flat, featureless plain dotted with occasional hard rock outcrops (inselbergs).
Geomorphology of Granitic Landscapes: The bedrock here consists primarily of ancient, extremely hard Bundelkhand gneiss and granite. Despite this flattened landscape, the rivers traversing the plateau—most notably the Betwa, Dhasan, and Ken—are highly energetic.
Hydrological Energy of Central Indian Rivers: Because these rivers flow over extremely hard and uneven granitic bedrock, they frequently experience sudden drops in elevation. This results in the formation of deep, steep-sided gorges, turbulent rapids, and stunning waterfalls as the rivers carve their way northwards toward the Yamuna. These river systems are vital lifelines in an otherwise drought-prone, semi-arid region.

📌 Geography • Physiography

Q.15) The highest elevation of the Meghalaya Plateau is the Shillong Peak (1,823 m). Which peak stands as the highest point of the nearby Garo Hills?

Ans > Nokrek

Explanation: While the Shillong Peak is the highest elevation in the Meghalaya Plateau, Nokrek (1,412 m) is explicitly noted as the highest peak of the Garo Hills.
The Meghalaya Plateau as a Peninsular Block: Geographically, the Meghalaya Plateau is not a part of the young Himalayan mountain system; rather, it is an eastern extension of the ancient Indian Peninsular block, separated from the Chotanagpur plateau by the Malda Fault gap. The plateau is subdivided into the Garo, Khasi, and Jaintia hills.
Biodiversity of the Nokrek Biosphere Reserve: While the Shillong Peak in the Khasi hills is the overall highest point, the highest elevation specifically within the western Garo Hills is Nokrek, standing at about 1,412 meters. This peak is environmentally vital and serves as the core of the Nokrek Biosphere Reserve and National Park.
Topographical Layout of the Northeast: The region is internationally recognized for its incredible biodiversity, harboring rare species like the red panda, hoolock gibbons, and wild Asian elephants. Furthermore, the steep slopes of the Garo Hills combined with heavy monsoonal rains make this region one of the wettest landscapes on the planet.

📌 Geography • Physiography

Q.16) The Dandakaranya region sprawls over parts of Orissa, Chhattisgarh, and Andhra Pradesh, featuring rich iron-ore deposits in the Bailadila Range. This undulating plateau is primarily drained by the Tel, Udanti, Sabari, and Sileru rivers, which are tributaries of which major river system?

Ans > Mahanadi and Godavari rivers

Explanation: Dandakaranya is an undulating plateau drained by the Tel and Udanti (tributaries of Mahanadi) and the Sabari and Sileru (tributaries of Godavari rivers).
The Mythological and Historical Significance: The Dandakaranya region holds immense cultural and geographic significance in India. Mentioned in the ancient epic Ramayana as a dense, formidable forest, today it encompasses a rugged, undulating plateau covering parts of Chhattisgarh, Odisha, and Andhra Pradesh.
Mineral Wealth of the Bailadila Range: This region is structurally composed of ancient Archean rocks and is globally famous for the Bailadila mountain range, which houses some of the world’s highest-grade hematite iron ore deposits, heavily exported to nations like Japan.
The Tributary Networks of the East Coast: Hydrologically, Dandakaranya acts as a major drainage basin. The plateau is heavily dissected by rivers like the Tel and Udanti, which flow northward to join the mighty Mahanadi river. Simultaneously, rivers like the Sabari and Sileru carve their way south and west to feed into the massive Godavari river system. This complex river network supports dense tropical moist deciduous forests.

📌 Geography • Physiography

Q.17) The highest peak of the Baba-Budan Hills is Mullayanagiri (1,930 metres). This peak is geographically located within which plateau of the South Deccan?

Ans > Karnataka Plateau

Explanation: The Karnataka Plateau spans the state of Karnataka and parts of Kerala. Its highest peak in the Baba-Budan Hills is Mullayanagiri (1,930 metres), which is the highest point in Karnataka.
The Iron Ore and Coffee Heritage of Karnataka: The Karnataka Plateau is a prominent subdivision of the larger South Deccan plateau, characterized by rolling uplands and steep mountainous borders along its western edge. The Baba-Budan Hills, located in the Chikkamagaluru district, are a pivotal geographic feature within this plateau. Historically, these hills are famous as the birthplace of Indian coffee, allegedly introduced by the Sufi saint Baba Budan in the 17th century.
Topography of the Western Ghats: The highest peak within this specific range—and the highest point in the entire state of Karnataka—is Mullayanagiri, towering at 1,930 meters. The region is geologically composed of Dharwar rock systems, making the hills incredibly rich in iron ore deposits.
The Significance of Mullayanagiri: The intense monsoonal rains intercepted by the high elevations of the Baba-Budan and surrounding hills create a verdant, highly biodiverse ecosystem that transitions into the unique Shola forests found at the highest altitudes.

📌 Geography • Physiography

Q.18) The Nandi valley is noted as a famous summer resort located in the southern part (Maidan) of which physiographic region?

Ans > Karnataka Plateau

Explanation: The southern part of the Karnataka plateau is called the Maidan, which is drained by the Kaveri and Tungabhadra rivers, and the Nandi valley is a summer resort in this region.
The Dual Topography of the Karnataka Plateau: The Karnataka Plateau is geographically divided into two distinct regions: the “Malnad” (the hilly, forested region adjacent to the Western Ghats) and the “Maidan” (the relatively flat, open plains stretching eastwards). The southern portion of this Maidan region features undulating granitic terrain dotted with prominent isolated hillocks.
The Historic Importance of Nandi Hills: Among these, the Nandi Hills (or Nandi Valley) is a highly significant geographical and historical landmark. Located just north of modern-day Bengaluru, this area serves as a popular summer resort due to its elevated, cooler microclimate compared to the surrounding plains. Historically, the Nandi Hills were heavily fortified by rulers like Tipu Sultan to serve as an impenetrable stronghold.
Geomorphology of the Maidan: Hydrologically, this specific high ground in the Maidan acts as the origin point for several important regional rivers, including the Arkavathi, Pennar, and Palar rivers, which flow out across the broader southern plateau.

📌 Geography • Physiography

Q.19) What is the geographical gap, approximately 24 km wide, that separates the Tamil Nadu Uplands and the Nilgiris from the southern coast of Kerala, allowing the Gayitri river to flow through from east to west?

Ans > Palakkad Gap (Palghat)

Explanation: Between Coimbatore and Anaimalais, there is a broad gap known as the Palakkad Gap (Palghat), about 24 km wide, through which flows the Gayitri river from east to west joining Tamil Nadu with the coast of Kerala.
Tectonic Origins of the Palghat Gap: The Palakkad Gap (or Palghat Gap) is a massive, highly unusual geographical anomaly in the otherwise continuous, impenetrable wall of the Western Ghats. Located between the Nilgiri Hills to the north and the Anaimalai Hills to the south, this major mountain pass is approximately 24 kilometers wide. Geologists believe the gap was formed millions of years ago by ancient river erosion or sheer tectonic shearing prior to the breakup of the Gondwana supercontinent.
Climatic and Cultural Impact: The gap has profound climatic and cultural impacts. It acts as a funnel, allowing the moisture-laden South-West Monsoon winds to penetrate deeply into the otherwise dry Tamil Nadu plains, and conversely lets dry, hot easterly winds blow into Kerala.
The East-West Transportation Corridor: Culturally and economically, it has served as the primary historical trade route and natural highway connecting the Malabar Coast of Kerala with the Coromandel plains of Tamil Nadu.

📌 Geography • Physiography