Physical & Regional Geography

Statement 1 is correct: The Narmada River flows through a linear rift valley, formed due to faulting and subsidence between two upland regions — the Vindhya Range (north) and the Satpura Range (south). This tectonic feature directs the river’s flow toward the west. Statement 2 is incorrect: The river indeed flows between the Vindhyas and the Satpuras, following the east–west oriented rift valley, But do not adequately explain why Narmada flows westward. Confinement could lead a river to flow in either direction. Statement 3 is incorrect: The general slope of the Peninsular Plateau is from west to east, which is why most peninsular rivers (like Godavari, Krishna, and Mahanadi) flow eastward into the Bay of Bengal. The Narmada’s westward flow is an exception due to its rift valley structure, not due to land slope.

* The word Kharif is Arabic for autumn, since the season coincides with the beginning of autumn or winter. * Kharif crops also are known as monsoon crops. These are the crops that are cultivated in the monsoon season. * The Kharif season differs in every state of the country but is generally from June to September. * These crops are usually sown at the beginning of the monsoon season around June and harvested by September or October. * Rice, maize, bajra, ragi, soybean, groundnut, cotton are all Kharif types of crops.

Statement 1 is correct: The trees are very tall (up to 50 m or more) and grow close together, competing for sunlight. Their crowns form a dense, multilayered canopy that blocks most sunlight from reaching the ground. Statement 2 is correct: Equatorial forests are the most biodiverse ecosystems on Earth. A single hectare can host hundreds of tree species, along with diverse fauna and microorganisms. This is due to stable climate and continuous growing season. Statement 3 is correct: Epiphytes (plants growing on other plants) such as orchids, mosses, and ferns thrive here. The humid atmosphere and dense canopy support their growth on trunks and branches.

Steppes: Steppes are usually characterized by a semi-arid or continental climate. Extremes can be recorded in the summer of up to 45 °C (113 °F) and in winter, 55 °C (67°F). Besides this huge difference between summer and winter, the differences between day and night are also very great. African Savannah & North American Prairie: These regions have more rainfall and varied landscapes compared to the Steppe. Nomadic herding existed, but wasn't the sole way of life. Siberian Tundra: Colder, less rain, permafrost. Not ideal for grazing animals. Nomadic herding is less prevalent. Therefore, the Central Asian Steppe, with its extreme climate, limited rainfall, and historical dependence on nomadic herding, best fits the description in the statement.

Statement 1 is correct: Nearly all laterites are of rusty-red colouration, because of high iron oxide content. Statement 2 is incorrect: Laterite is rich in iron and aluminium but poor in nitrogen, potash, potassium, lime, and organic matter. It is commonly considered to have formed in hot and wet tropical areas. Statement 3 is incorrect: Laterite soil is commonly found in areas of high altitude and heavy rainfall in Karnataka, TN, MP, Bihar, Orissa, Assam, and Meghalaya. Statement 4 is correct: Plants like Cashew grow well along with Tapioca in this type of soil.

The most important fishing grounds of the world are found in the regions where warm and cold oceanic currents meet. Here's why: Nutrient-rich waters: When warm and cold currents converge, a process known as upwelling occurs. This upwelling brings nutrient-rich deep ocean water to the surface. These nutrients act like fertilizer for plankton, which forms the base of the marine food chain. Abundant Marine Life: The abundance of plankton attracts a vast array of fish species, making these areas highly productive fishing grounds. Examples include:
1. The Grand Banks (Newfoundland) - Labrador Current (cold) meets the Gulf Stream (warm)
2. The Humboldt Current (South America) - Cold, nutrient-rich current flowing up the western coast
3. The Canary Current (West Africa) - Cold, nutrient-rich current flowing up the western coast

All of the listed phenomena (1-6) are responsible for bringing dynamic changes on the surface of the Earth. Electromagnetic Radiation: Sunlight drives weather patterns, influences temperatures, and is crucial for plant life (photosynthesis). Geothermal Energy: Heat from the Earth's core fuels volcanic activity, drives plate tectonics, and shapes landforms. Gravitational Force: The Moon's gravity creates tides in our oceans, influencing coastlines and erosion. Plate Movements: The movement of tectonic plates causes mountain formation, earthquakes, and continental drift, constantly reshaping the Earth's surface. Rotation of the Earth: Earth's rotation creates day and night cycles, affecting weather patterns and influencing wind and ocean currents. Revolution of the Earth: Earth's revolution around the Sun causes seasons, impacting temperatures and weather patterns globally. These forces act together in a complex interplay, constantly sculpting and reshaping the Earth's surface over vast timescales.

The correct answer is 1 only (Thermal difference between land and water). Statement 1 is correct: Land heats up and cools down much faster than water. This is because water has a higher specific heat capacity, meaning it takes more energy to heat it up and more energy to cool it down. Coastal areas, being influenced by large water bodies, experience a moderating effect on temperature fluctuations. The temperature changes are more gradual throughout the year. Statement 2 is incorrect: While altitude can affect temperature (higher altitude generally means cooler temperatures), this is not the primary reason for the difference between continental interiors and coasts. Both continents and oceans have variations in altitude. Statement 3 is incorrect: Winds can play a role in influencing local temperatures, but their presence wouldn't explain the consistent pattern of higher annual ranges seen in continental interiors. Statement 4 is incorrect: Rainfall patterns can affect temperature to some extent, but coastal areas often receive more rainfall compared to continental interiors. This wouldn't explain the higher annual range observed inland.

Statement 1 is incorrect: Natural gas in India is mostly found in Assam, Gujarat, and offshore basins (like Mumbai High). Gondwana beds are primarily coal-bearing formations, not major sources of natural gas. Statement 2 is correct: Koderma district in Jharkhand is known as the “mica capital of India”. Statement 3 is incorrect: Dharwar rocks (in Karnataka and Maharashtra) are ancient metamorphic rocks, not petroleum-bearing formations.

Statement 1 is correct: The most significant characteristic of Indian coal is its high ash content, which varies from 35 to 45 per cent, compared with that of coal in other parts of the world, which is around 15 per cent. Statement 2 is correct: Indian coal's sulphur content is low, about 0.5 per cent. Statement 3 is incorrect: Besides high ash content, another reason for entrained gasifiers (that operate at higher temperatures than fluidised bed gasifiers), commonly used in IGCC plants abroad, being not suitable for Indian coal has a high ash fusion temperature of about 1,500.