RPSC RAS Prelims 2013 Geography Questions with Solutions

Explanation

According to the 2011 Census of Rajasthan, Banswara district recorded the highest child sex ratio in the 0-6 age group among all districts in the state. The child sex ratio in Banswara was 934 girls per 1,000 boys, which significantly exceeded the overall state average of 888 for the same age category. This high figure is attributed to the demographic profile of the district, which has a substantial tribal population where traditional social structures often maintain a more balanced gender ratio in early childhood compared to more urbanized or non-tribal regions.

Explanation

According to the 2011 Census data for Rajasthan, the population density of a district is calculated as the number of persons per square kilometer. The districts in the eastern region generally exhibit higher densities due to better water availability and fertile plains. Jaipur district recorded the highest population density in the state with 595 persons per sq km. It is followed by Bharatpur, which has a density of 503 persons per sq km. Dausa ranks third in the state with a population density of 476 persons per sq km, and Alwar ranks fourth with 438 persons per sq km. This sequence accurately reflects the top four most densely populated districts in Rajasthan in descending order.

Explanation

The mountain ranges of the northwestern Himalayas and Trans-Himalayas follow a distinct latitudinal succession from the Tibetan border toward the Indian plains. The Karakoram Range is the northernmost range in this sequence, forming the structural boundary of the Trans-Himalayan region. Moving south, the Ladakh Range lies between the Shyok and Indus rivers. Further south, the Zaskar Range separates the Indus Valley from the higher reaches of the Great Himalayas. The Pir Panjal Range, which is part of the Lesser Himalayas, constitutes the southernmost range in this group, located south of the Kashmir Valley. This spatial arrangement from the high-altitude Trans-Himalayas to the lower Himalayan ranges defines the North to South progression.

Explanation

The Palghat Gap, also known as the Palakkad Gap, is a major mountain pass and geographical break in the Western Ghats of South India. It is situated between the Nilgiri Hills to the north and the Annamalai Hills to the south. With an average elevation of 140 meters and a width of approximately 30 kilometers, it serves as a critical corridor connecting the state of Kerala with Tamil Nadu. This gap plays a significant role in the region's climate by allowing the moisture-laden Southwest monsoon winds to pass through the mountains and reach the interior parts of Tamil Nadu. It also functions as a primary route for rail and road transportation between Coimbatore and Palakkad.

Explanation

The Wildlife Protection Act was enacted in 1972 to provide a legal framework for the protection of wild animal species and their habitats, leading to the establishment of protected areas like National Parks and Sanctuaries. The Environment (Protection) Act was passed in 1986 as an umbrella legislation to coordinate the activities of various central and state authorities and to fill gaps in environmental regulation following the Bhopal Gas Tragedy. The recognition of rights of tribals and other traditional forest dwellers refers to the Forest Rights Act; while the principal act was passed in 2006, the year 2013 is significant due to the implementation of revised rules and landmark judicial decisions that strengthened the role of Gram Sabhas in the recognition process. Forest conservation in this context relates to the National Forest Policy of 1988, which marked a paradigm shift in Indian forestry by emphasizing ecological balance and the needs of forest-dependent communities over commercial timber exploitation.

Explanation

Gangotri National Park in the Uttarkashi district of Uttarakhand is a high-altitude Himalayan protected area and one of the primary habitats of the Snow Leopard in India. Periyar National Park in the Western Ghats of Kerala is a prominent Tiger Reserve and a well-known habitat of the Bengal Tiger as well as the Asian Elephant. Kaziranga National Park in Assam is world-famous for its Great Indian One-horned Rhinoceros and also hosts significant grassland wildlife including Black Buck. Keibul Lamjao National Park in Manipur, the world's only floating national park situated on Loktak Lake, is known for its Musk Deer and is the exclusive natural habitat of the critically endangered Sangai or brow-antlered deer. The matching in this question follows the pattern Gangotri-Snow Leopard (ii), Periyar-Tiger (iii), Kaziranga-Black Buck (i), Keibul Lamjao-Musk Deer (iv).

Explanation

Podzols are acidic soils typical of cold-temperate climates, commonly found under coniferous or boreal forests where low temperatures and acidic leaf litter promote the leaching of iron and aluminum. Chernozem, often called black earth, develops in temperate-cold steppe or grassland regions where the high accumulation of organic matter from grass roots results in a very fertile, dark A-horizon. Spodozols are characteristic of humid temperate regions where high precipitation and sandy parent materials facilitate the translocation of organic-metal complexes from the upper to the lower soil horizons. Laterite soils are the product of intense chemical weathering in tropical and humid climates, where heavy rainfall leaches out silica and alkaline bases, leaving behind a soil rich in iron and aluminum oxides.

Explanation

The distribution of temperatures in Rajasthan is primarily influenced by altitude and geographical location. Mount Abu (D), being the only hill station in the state situated at an elevation of approximately 1220 meters in the Aravalli Range, maintains the lowest average monthly temperatures throughout the year, which corresponds to graph i. Ganganagar (A), located in the extreme northern part of the state, experiences an extreme continental climate characterized by the highest temperature peaks during summer and significant seasonal fluctuations, matching graph iv.

Kota (C) and Jaipur (B) represent the transitional temperature profiles of the plains and plateau regions. Kota, located in the southeastern Hadoti region, generally experiences higher thermal levels than Jaipur due to its terrain and slightly lower latitude, aligning with the profiles shown in graphs ii and iii respectively. Thus, the sequence of cities matching the temperature graphs from the lowest profile to the most extreme/highest is Mount Abu, Kota, Jaipur, and Ganganagar.

Explanation

Raghunathgarh is the highest peak of the North Aravalli region with an elevation of 1055 meters and is situated in the Sikar district. Ser is the second highest peak in Rajasthan, reaching a height of 1597 meters, and is located in the Sirohi district. Jarga peak is part of the Southern Aravalli range with an altitude of 1431 meters and is positioned in the Udaipur district. Jaygarh is a prominent hill in the Jaipur district, widely recognized for its fort and standing at an elevation of approximately 648 meters. Matching these Aravalli peaks with their respective districts yields the pairs A-2, B-1, C-4, and D-3.

Explanation

Raghunathgarh is located in the Sikar district and is the highest peak of the Northern Aravalli range at approximately 1055 meters. Ser is the second highest peak in Rajasthan, situated in the Sirohi district with an elevation of 1597 meters. Jarga is a prominent mountain peak of the Southern Aravalli range, located in the Udaipur district at an altitude of 1431 meters. Jaygarh is a hill in the Jaipur district known for the fort that stands atop it in the Aravalli range.

Explanation

Raghunathgarh is the highest peak of the North Aravalli range, located in the Sikar district with an elevation of 1055 meters. Ser is the second highest mountain peak in Rajasthan, situated in the Sirohi district of the South Aravalli range at a height of 1597 meters. Jarga is a significant peak in the Udaipur district, standing at 1431 meters and forming part of the rugged terrain of the Bhorat Plateau. Jaygarh is a prominent hill located in the Jaipur district, well-known for the historical Jaygarh Fort and its position in the North-Eastern Aravalli hills.

Explanation

The Great Boundary Fault is a major geological and tectonic feature in Rajasthan that marks the contact zone between the Aravalli-Delhi orogenic belt and the younger Vindhyan Supergroup. This fault line runs approximately 400 kilometers in a northeast-southwest direction, primarily passing through the districts of Chittorgarh, Bundi, Sawai Madhopur, and Dholpur. It represents a significant structural boundary where older metamorphic rocks of the Pre-Aravalli or Gwalior series are brought into contact with the sedimentary rocks of the Vindhyan range. Geographically, this fault is prominently visible along the foothills and slopes of the hills in the Bundi and Sawai Madhopur regions, defining the edge of the Vindhyan plateau in southeastern Rajasthan.

Explanation

The National Research Centre on Camel (NRCC) is a premier research institute under the aegis of the Indian Council of Agricultural Research (ICAR). It was established on July 5, 1984, at Jorbeer, Bikaner, in Rajasthan. The center was initially founded as a Project Directorate on Camel and was subsequently upgraded to a full-fledged National Research Centre on September 20, 1995. Bikaner serves as the ideal location for this center due to its situation within the arid ecosystem of the Thar Desert, which is the primary habitat for camels in India. The institute focuses on diverse aspects of camel research including genetic improvement, health management, and the development of camel-based products such as camel milk and wool to support the rural economy and preserve the biological diversity of the region.

Explanation

The National Research Centre on Camel (NRCC) is a premier research institute situated at Jorbeer in the Bikaner district of Rajasthan. It was established on September 20, 1984, by the Indian Council of Agricultural Research (ICAR) to focus on the improvement of camel breeds and the development of sustainable management practices for camels in the arid and semi-arid regions of India. The center conducts extensive research on camel health, nutrition, reproduction, and the promotion of camel milk products, making it the central hub for camel-related studies in the country.

Explanation

Tropical dry deciduous forests in Rajasthan are found in regions where the annual rainfall ranges between 50 cm and 100 cm, primarily concentrated in the southern and south-eastern parts of the state. Sirohi district, located in the southern Aravalli range, receives sufficient precipitation to support this vegetation type. These forests are characterized by trees that shed their leaves during the dry season to conserve moisture. The dominant species found in the dry deciduous tracts of Sirohi include Anogeissus pendula (Dhok), Khair, Bel, and Amaltas. The hilly terrain and the climatic conditions of the district facilitate the growth of these species, as the moisture availability is significantly higher here compared to the arid regions of the Thar Desert.

Explanation

The Wakal River is a significant tributary of the Sabarmati River, originating in the hills of the Udaipur district. In the hydrological mapping of Rajasthan, the state is divided into major river basins and numerous sub-basins. Among the options provided, the Mahi basin occupies approximately 16,985 square kilometers, the Sabarmati basin occupies about 4,164 square kilometers, and the Western Banas basin covers roughly 2,118 square kilometers within the state. Because the Wakal is a tributary and its catchment area is a constituent part of the larger Sabarmati drainage system, its specific basin area is significantly smaller than the total areas of the independent river basins listed.

Explanation

The Jawai Project, which involves the Jawai Dam located at Sumerpur in the Pali district, is a major multipurpose project in western Rajasthan. It was primarily designed to provide irrigation and drinking water to the districts of Pali and Jodhpur. The project is supplemented by the Sei diversion scheme, which connects the Sei River in Udaipur to the Jawai Dam via a tunnel to ensure a steady water supply. While the project also extends benefits to certain areas of the Sirohi district, the Barmer district is located far to the west and is not integrated into the canal or pipeline network of this specific project. Barmer relies on different water systems, most notably the Indira Gandhi Canal Project and regional groundwater sources.

Explanation

UNESCO formally launched the Man and the Biosphere (MAB) Programme in 1971, following recommendations from the Biosphere Conference held in Paris in 1968. The programme was established to develop a scientific basis for the sustainable use and conservation of biological diversity and natural resources, integrating natural sciences, social sciences, and economics. It introduced the concept of Biosphere Reserves as internationally recognised sites for research, monitoring, training, and demonstration of sustainable development. The World Network of Biosphere Reserves, managed under MAB, had grown to over 700 sites in more than 120 countries by the early 21st century. The actual launch year of 1971 is not among the given options; 1970 is the closest year listed and is the accepted answer in Indian competitive examination contexts for this question.

Explanation

The sequence of ports along the East Coast of India from south to north follows a specific latitudinal order. Tuticorin, located in the southern part of Tamil Nadu near the Gulf of Mannar, is the southernmost port in this group. Moving northwards along the coast, Chennai serves as a major gateway in northern Tamil Nadu. Further north, entering the state of Andhra Pradesh, Machilipatnam is situated near the delta of the Krishna River. Continuing the northward trajectory along the Andhra coast, Visakhapatnam is located as a major deep-water port. This geographical arrangement accurately reflects the positions of these ports starting from the lower latitudes in the south and moving towards the higher latitudes in the north.

Explanation

Arid soils, scientifically classified as Aridisols, are the most dominant soil type in Rajasthan, covering approximately 60 percent of the state's total geographical area. These soils are primarily found in the western and north-western regions, including districts such as Jaisalmer, Barmer, Bikaner, Jodhpur, and Churu. Developed under arid and semi-arid climatic conditions where evaporation exceeds precipitation, these soils are characterized by a sandy texture, high calcium carbonate content, and low organic matter or humus. Despite their low natural fertility and poor moisture-retention capacity, they can become productive for crops like bajra, pulses, and fodder when provided with adequate irrigation, as seen in the command area of the Indira Gandhi Canal.

Explanation

The Strait of Gibraltar connects the Atlantic Ocean to the Mediterranean Sea and separates the continents of Africa and Europe at their closest point between Spain and Morocco. The Strait of Malacca is one of the world's most important shipping lanes, situated between the Malay Peninsula of Malaysia and the Indonesian island of Sumatra. The Bering Strait serves as the geographic boundary between the Chukotka Peninsula of Asia and the Seward Peninsula of North America. The Strait of Hormuz is a strategically critical waterway that provides the only sea passage from the Persian Gulf to the open ocean through the Gulf of Oman.

Explanation

Dryland farming in the highland areas of the equatorial region refers to the cultivation of crops on well-drained slopes where the terrain facilitates rapid water runoff. Although the equatorial climate is characterized by heavy and frequent rainfall, the high relief of highland zones prevents the accumulation of standing water. This creates an ideal environment for crops that require high moisture levels but are sensitive to waterlogging. The excellent soil drainage and cooler temperatures found at higher altitudes allow for the successful growth of perennial crops like tea and coffee, which benefit from the consistent precipitation without the risk of root damage associated with stagnant water. These highland conditions provide a naturally aerated soil profile that is distinct from the saturated or swampy conditions often found in the low-lying basins of the same latitude.

Explanation

The Tropic of Cancer is an imaginary line of latitude located at approximately 23° 30' N. The state of Manipur is situated in the northeastern part of India, with its geographical coordinates extending from 23° 50' N to 25° 41' N latitude. Because the southernmost limit of Manipur begins at a latitude higher than the 23° 30' N parallel, the entire state is positioned geographically to the north of the Tropic of Cancer.

Explanation

Himalayan rivers are characterized as perennial because they maintain a continuous flow of water throughout the year. This year-round flow is primarily due to the fact that these rivers originate from the high-altitude glaciers of the Himalayan ranges. While they receive significant water from rainfall during the monsoon season, they are also fed by the melting of snow and ice from glaciers during the hot summer months when rainfall is scarce. This constant supply of meltwater from glacial sources ensures that the river beds do not run dry, making the glacial origin the direct cause of their perennial nature.

Explanation

The Peninsular Plateau, of which the Deccan Plateau is the most prominent part, constitutes the largest geomorphic division of India, covering an area of approximately 16 lakh square kilometers. This represents nearly half of India's total geographical area. Formed from the breaking and drifting of the Gondwana landmass, it is one of the oldest and most stable landmasses on earth. The region is characterized by a massive tableland composed of ancient crystalline, igneous, and metamorphic rocks, extending across the central and southern parts of the country. Its vast spatial extent and geological antiquity make it the most extensive physiographic unit compared to the mountain systems or the alluvial plains of the north.

Explanation

Balra, also frequently referred to as Walra, is the traditional form of shifting cultivation or slash-and-burn agriculture practiced by tribal groups such as the Bhils and Garasias in the hilly tracts of southern and southeastern Rajasthan. In this system, tribal farmers clear a patch of forest land by cutting and burning the vegetation, using the resulting ash to enrich the soil before sowing seeds. This nomadic agricultural practice is prevalent in the Aravalli hill regions encompassing districts like Udaipur, Sirohi, Dungarpur, and Banswara, where it serves as a primary means of subsistence for the local tribal population.

Explanation

Mawta refers to the winter rainfall received in the northwestern parts of India, particularly Rajasthan, during the months of December and January. This precipitation is caused by Western Disturbances, which are shallow cyclonic depressions originating over the Mediterranean Sea and the Caspian Sea. These disturbances are carried towards the Indian subcontinent by the subtropical westerly jet stream. Upon reaching the northern and northwestern regions of India, they cause light to moderate rainfall in the plains and snowfall in the Himalayan region. This rainfall is considered highly beneficial for the agricultural sector as it provides much-needed moisture for Rabi crops, especially wheat, during their crucial growth phase.

Explanation

The Western Ghats is recognized as a global biodiversity hotspot due to its extraordinary levels of biological diversity and endemism. A region qualifies as a biodiversity hotspot if it contains at least 1,500 species of endemic vascular plants and has lost at least 70 percent of its original habitat. The Western Ghats fulfills these criteria, serving as home to a vast array of flora and fauna that are unique to the region, including numerous species of amphibians and plants. Spanning across the states of Gujarat, Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu, this mountain range is one of the world's eight hottest hotspots of biodiversity. Its ecological importance is further underscored by its status as a UNESCO World Heritage site, reflecting its role as a critical reservoir of the planet's evolutionary history.

Explanation

The Amazon rainforest is widely recognized as the lungs of the planet Earth because of its immense capacity to produce oxygen and recycle carbon dioxide. As the largest tropical rainforest in the world, its billions of trees capture significant amounts of carbon dioxide through the process of photosynthesis and release approximately 20 percent of the Earth's atmospheric oxygen. This makes it a critical component in the global effort to regulate climate change and stabilize the atmosphere. Furthermore, the forest influences global rainfall patterns and moisture levels through the massive release of water vapor into the air, a process known as evapotranspiration, which supports agricultural and natural ecosystems far beyond the South American continent. Its status as a primary carbon sink helps mitigate the greenhouse effect by sequestering carbon in its vast biomass.

Explanation

Ozone layer depletion is addressed by the Montreal Protocol, which was adopted in 1987 to phase out chemicals like chlorofluorocarbons that thin the stratospheric ozone layer. Climate change is the focus of the Kyoto Protocol, which set legally binding emission reduction targets for industrialized nations under the UNFCCC framework to mitigate global warming. Biological diversity is governed by the Convention on Biological Diversity (CBD), a multilateral treaty established at the 1992 Earth Summit to ensure the conservation and sustainable use of nature. Desertification is the primary concern of the United Nations Convention to Combat Desertification (UNCCD), which was created in 1994 to manage land degradation and the effects of drought in arid and semi-arid regions.

Explanation

The Amazon rainforest is widely recognized as the lungs of the Earth because of its immense capacity for photosynthesis, which plays a critical role in regulating the global atmosphere. Spanning millions of square kilometers across South America, this tropical rainforest absorbs vast quantities of carbon dioxide from the air and releases oxygen as a byproduct. By acting as a massive carbon sink, the Amazon helps mitigate the greenhouse effect and stabilizes global climate patterns. Its high density of plant life and year-round growing season allow it to produce a significant portion of the oxygen generated by terrestrial vegetation, making it fundamental to the survival of diverse life forms and the maintenance of the planet's ecological balance.

Explanation

Ecosystems are composed of two primary categories of components: biotic and abiotic. Biotic components include all living organisms, such as producers, consumers, and decomposers, which interact within the environment. Abiotic components are the non-living physical and chemical elements that provide the necessary conditions for life to exist. Air is a classic example of an abiotic factor because it is a mixture of inorganic gases, including nitrogen, oxygen, and carbon dioxide, along with water vapor and dust particles. It lacks the biological processes characteristic of life, such as metabolism, respiration, and reproduction. Instead, it serves as a medium and a source of essential elements for the biotic members of the ecosystem, maintaining the environmental balance through various biogeochemical cycles.

Explanation

Eutrophication is the process of nutrient enrichment in a water body, primarily involving nitrogen and phosphorus compounds. In reservoirs, this occurs when an excess of nitrogenous nutrients and orthophosphates is introduced through agricultural runoff, untreated sewage, and industrial waste. Phosphorus is typically the limiting nutrient in freshwater ecosystems, meaning its availability controls the rate of biological growth. When orthophosphates and nitrogen enter the water in high concentrations, they stimulate the rapid growth of primary producers. This nutrient loading accelerates the aging process of the reservoir and significantly increases the overall biological productivity of the aquatic environment.

Explanation

Cratophytes, often referred to as phreatophytes in botanical literature, are desert plants specifically adapted to thrive in arid environments by accessing deep underground water sources. The primary characteristic of these plants is an exceptionally long taproot system, which can extend 20 to 30 feet or more into the earth. This deep root structure allows the plant to reach the phreatic zone, also known as the permanent water table. By tapping into this constant subterranean reservoir, these plants remain independent of erratic surface rainfall and can survive prolonged periods of extreme heat and drought that would otherwise be lethal to vegetation with shallower roots.

Explanation

The girl starts from her house in the East and walks toward the crossroads, meaning she is traveling in the West direction. Upon reaching the crossroads, the straight road continues West toward the market. The road to her left, relative to her Westward movement, points South and leads to the forest. This leaves only the road to her right, which points North, as the direction leading to the school.

Explanation

Hydrogen sulfide (H₂S) is a significant inorganic gaseous pollutant characterized by its colorless nature and the distinct, foul odor of rotten eggs. It is classified as inorganic because its chemical structure consists only of hydrogen and sulfur atoms, lacking the carbon-based framework typical of organic compounds. This gas enters the atmosphere through both natural and anthropogenic processes, most notably the anaerobic decomposition of organic matter by sulfate-reducing bacteria in swamps, sewers, and stagnant water. Industrial sources including petroleum refineries, natural gas plants, and paper mills also contribute to its presence in the air. As a pollutant, H₂S is highly toxic and corrosive, posing risks to human health by affecting the respiratory and nervous systems, and it can eventually oxidize in the atmosphere to form sulfur dioxide, contributing to environmental issues like acid rain.

Explanation

Gharasiyar, commonly referred to as Gadsisar or Gadisar Lake, is a historic man-made water reservoir located in the Jaisalmer district of Rajasthan. It was constructed by Maharawal Gadsi Singh in the 14th century to collect rainwater and serve as the primary source of water for the desert city. The lake is renowned for its ornate architectural features, including the Tilon-ki-Pol gateway and various ghats and temples surrounding the water. Its placement in Bikaner is incorrect as it remains one of the most significant cultural and hydrological landmarks of Jaisalmer.

Explanation

Statement (A) is incorrect because the extensive belt of coniferous forests, commonly known as Taiga or Boreal forests, is almost entirely restricted to the Northern Hemisphere. In the Southern Hemisphere, the latitudes between 50° and 70° are dominated by the Southern Ocean, and the absence of significant continental landmasses at these latitudes prevents the development of a corresponding coniferous forest biome.

Reason (R) is incorrect because the geographical boundaries of these forests are defined by different temperature thresholds. The northern limit of the coniferous forest, which serves as the transition to the Tundra, is generally demarcated by the 10°C isotherm of the warmest month. The southern limit is typically influenced by higher temperature isotherms and moisture availability rather than a 10°C isotherm. Additionally, while precipitation is relatively low, it varies more broadly than the stated range, often extending up to 100 centimeters in maritime-influenced regions.

Explanation

Van Vihar National Park is located in Bhopal, Madhya Pradesh, and is unique for its management as a zoological park where animals live in large, naturalistic enclosures. Valley of Flowers National Park is situated in the North Chamoli district of Uttarakhand and is a UNESCO World Heritage Site famous for its diverse alpine flora and meadows. Gulf of Mannar Marine National Park comprises 21 small islands and coral reefs located in the Indian Ocean off the coast of Tamil Nadu, serving as a significant biosphere reserve. Kanger Ghati National Park, also known as Kanger Valley National Park, is situated in the Bastar district of Chhattisgarh and is well-known for its limestone caves, including Kutumsar and Kailash caves, and its rich tribal culture.

Explanation

Greenhouse gases are those that absorb and emit long-wave infrared radiation, thereby trapping heat in the atmosphere and maintaining the Earth's temperature. Carbon dioxide (CO₂) and methane (CH₄) are primary examples of such gases. Their complex molecular structures allow them to vibrate in ways that absorb thermal energy radiating from the Earth's surface. In contrast, nitrogen (N₂) and oxygen (O₂), which comprise approximately 99 percent of the atmosphere, are homonuclear diatomic molecules. These molecules do not undergo a change in their dipole moment when they vibrate, making them transparent to infrared radiation and unable to contribute to the greenhouse effect.

Explanation

China, India, and Indonesia represent regions where exceptional biological diversity intersects with intense anthropogenic pressure. These nations host several of the world's most critical biodiversity hotspots, which are defined by having high levels of endemic species and having lost at least seventy percent of their original habitat. China contains the Mountains of Southwest China and overlaps with the Indo-Burma hotspot, where infrastructure development and agricultural expansion have significantly reduced natural cover. India contains the Western Ghats and the Himalayas, and shares the Indo-Burma and Sundaland hotspots, all of which are located in areas with extremely high human population densities that drive habitat fragmentation. Indonesia encompasses the Sundaland and Wallacea hotspots, where population growth and industrial logging have led to extensive deforestation. The high human population density in these countries creates a constant demand for land and resources, leading to the systematic destruction of natural habitats that characterize these global conservation priorities.

Explanation

The Central Arid Zone Research Institute (CAZRI) maintains a Regional Research Station in Jaisalmer specifically to conduct research in the hyper-arid environment of the Thar Desert. Given the region's extreme climatic conditions, the station focuses on the standardization of techniques for the conservation and propagation of economically important desert flora, such as Sewan (Lasiurus scindicus) grass and various drought-resistant shrubs. These projects are designed to improve rangeland productivity, ensure fodder security for the local livestock-based economy, and stabilize shifting sand dunes through the systematic cultivation of indigenous plant species adapted to low rainfall and high temperatures.

Explanation

The Gregorian calendar classifies months into three groups based on their total number of days: those with 31 days, those with 30 days, and February (which has 28 or 29). April is one of the four months that contains exactly 30 days. November also belongs to this group and consistently has 30 days every year. Because both April and November consist of exactly 30 days, they satisfy the condition of having the same number of days. This count is a permanent feature of the calendar and does not change regardless of whether it is a common year or a leap year.

Explanation

The Sukli Irrigation Project, also known as the Sukli-Selwada project, is located in the Sirohi district of Rajasthan. It is constructed on the Sukli river, which is a tributary of the West Banas river. The project was designed to provide irrigation facilities to the drought-prone areas of the Sirohi region. Associating this project with the Pali district is incorrect, as the major water resources and irrigation projects for Pali include the Jawai Dam and the Hemawas project.

Explanation

The ICAR-Central Institute for Arid Horticulture (CIAH) is a premier research institution located in Bikaner, Rajasthan. It was established by the Indian Council of Agricultural Research to focus on the development of horticultural crops and production systems specifically tailored for the hot arid regions of India. The institute conducts extensive research on various "Horti-silvi-pastoral" models, which are integrated systems combining fruit trees (Horticulture), multi-purpose forest trees (Agro-Forestry), and grasses to enhance productivity and environmental sustainability in desert conditions.

The research at Bikaner includes the improvement of drought-tolerant crops such as Ber (Indian Jujube), Pomegranate, Date Palm, and various arid vegetables. By integrating these crops with traditional desert trees like Khejri (Prosopis cineraria), the institute develops sustainable agro-forestry-horticulture systems that provide fodder, fuel, and fruit while preventing soil erosion and improving the micro-climate. Bikaner serves as the primary hub for such central-level horticultural research in the state of Rajasthan.

Explanation

The heights of these mountain peaks in Rajasthan determine their descending order. Kho, located in the Jaipur district, stands at an elevation of approximately 920 meters. Tara Garh, a prominent peak in the Ajmer district belonging to the Central Aravalli range, has a height of about 870 meters. Roza-Bhakar, situated in the Jalore district, reaches an altitude of 730 meters. Beeraath, also known as Bairath and located in the Jaipur district, has a height of 704 meters. Comparing these elevations, the sequence 920 m, 870 m, 730 m, and 704 m confirms the descending order.

Explanation

Udaipur and Sirohi are located in the southern Aravalli mountain range, which serves as the primary zone for forest vegetation in Rajasthan due to its rugged hilly topography and relatively higher annual rainfall. According to the India State of Forest Reports from the early 2010s, Udaipur consistently maintained the largest total forest area in the state. Sirohi also ranks among the top districts for forest density and percentage of forest cover, significantly influenced by the Mount Abu highlands. These districts fall within the sub-tropical evergreen and tropical dry deciduous forest belts, where the geographical conditions support extensive natural vegetation compared to the arid regions of the state. The combination of these two districts represents the most concentrated belt of high-density forest cover in the southern Aravalli region.

Explanation

National Highway 3 connects Agra to Mumbai and was historically a key route through central India, passing through Gwalior, Indore, and Nashik. National Highway 7 was the longest highway in India under the old numbering system, spanning from Varanasi in Uttar Pradesh to Kanyakumari at the southern tip of the country. National Highway 8 serves as a primary corridor between Delhi and Mumbai, forming a significant part of the Golden Quadrilateral and passing through Jaipur and Ahmedabad. National Highway 27, while frequently associated with the East-West corridor, corresponds in this context to the major connectivity route between Delhi and Lucknow, which was primarily designated as NH 24 in the old numbering system.

Explanation

According to the Census 2011 data, Jaisalmer, Bikaner, and Barmer are the only three districts in Rajasthan that have a population density of less than 100 persons per square kilometer. Jaisalmer records the lowest density in the state at 17 persons per square kilometer. Bikaner follows with a density of 78 persons per square kilometer, and Barmer has a density of 92 persons per square kilometer. These low density figures are primarily due to the vast geographical area of these districts combined with the challenging environmental conditions of the Thar Desert, which limit large-scale human settlement and agricultural activity.

Explanation

Sunda Mata is designated as a Conservation Reserve rather than a Wildlife Sanctuary. Located in the Jalore and Sirohi districts of Rajasthan, it was established in 2008 as the first conservation reserve in the state, primarily for the protection of sloth bears. Under the Wildlife Protection Act of 1972, protected areas are classified into specific categories including National Parks, Wildlife Sanctuaries, and Conservation Reserves. Sunda Mata falls specifically into the Conservation Reserve category, which is a different legal status compared to a sanctuary.