Question 1

Consider the following statements:
Statement I: The amount of dust particles in the atmosphere is more in subtropical and temperate areas than in equatorial and polar regions.
Statement II: Subtropical and temperate areas have less dry winds.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Both Statement I and Statement II are correct but Statement II does not explain Statement I. * Statement I is correct: Higher concentrations of atmospheric dust particles are concentrated in subtropical and temperate regions compared to equatorial and polar zones. * Statement II is not correct: Subtropical and temperate areas are dominated by vast dry, arid, and semi-arid wind systems. This dry air and prevailing wind pattern (not the lack of it) lofts dust particles into lower atmospheric layers, making Statement II false. Thus, option (c) is correct.

Question 2

Consider the following statements:
Statement I: In January, in the Northern Hemisphere, the isotherms bend equatorward while crossing the landmasses, and poleward while crossing the oceans.
Statement II: In January, the air over the oceans is warmer than that over the landmasses in the Northern Hemisphere.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Both Statement I and Statement II are correct and Statement II explains Statement I. * (a) is correct: In January (winter in the Northern Hemisphere), continental landmasses cool down abruptly while oceans retain heat, making the air over oceans warmer than over land, satisfying Statement II. * Because oceans are warmer, warm ocean currents (like the Gulf Stream and North Atlantic drift) cause equal-temperature lines (isotherms) to bend poleward (northward) over oceans. Over cool landmasses, the temperatures drop sharply, forcing the isotherms to bend equatorward (southward). Thus, Statement II explains the physical behavior described in Statement I.

Question 3

Consider the following statements:
Statement I: Of the two major ethanol producers in the world, i.e., Brazil and the United States of America, the former produces more ethanol than the latter.
Statement II: Unlike in the United States of America where corn is the principal feedstock for ethanol production, sugarcane is the principal feedstock for ethanol production in Brazil.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Statement I is correct but Statement II is not correct. * Statement I is not correct: The United States produces significantly more total ethanol than Brazil, with the US generating approximately 16.1 billion gallons and Brazil generating 8.8 billion gallons in 2024. * Statement II is correct: The principal agricultural feedstock processed for ethanol manufacturing in the US is corn, whereas Brazil primarily uses sugarcane to drive its production. Thus, option (d) is correct.

Question 4

Consider the following statements:
Statement-I: The atmosphere is heated more by incoming solar radiation than by terrestrial radiation.
Statement-II: Carbon dioxide and other greenhouse gases in the atmosphere are good absorbers of long wave radiation.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Statement-I is correct, but Statement-II is incorrect. * Statement-I is incorrect: The Earth's atmosphere is largely transparent to incoming short-wave solar radiation, allowing it to pass through to strike the surface. The surface absorbs this energy, heats up, and re-radiates it outward as long-wave terrestrial radiation, which heats the atmosphere from below. Thus, the atmosphere is indirectly heated more by terrestrial radiation than by direct incoming solar waves. * Statement-II is correct: Carbon dioxide and alternative atmospheric greenhouse gases are excellent, highly efficient absorbers of outgoing long-wave terrestrial radiation, trapping infrared heat within the lower troposphere. Therefore, option (d) is correct.

Question 5

Consider the following statements:
Statement-I: Thickness of the troposphere at the equator is much greater as compared to poles.
Statement-II: At the equator, heat is transported to great heights by strong convectional currents.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Both Statement-I and Statement-II are correct and Statement-II explains Statement-I. * (a) is correct: The troposphere's structural height varies drastically over the globe, extending roughly to 8 km over polar zones and expanding up to 18 km above equatorial regions, validating Statement-I. * Intense solar insolation at the equator heats the surface, causing air to expand and generate powerful, deep vertical convectional currents that loft thermal energy up to great heights, validating Statement-II. * Because these active, intense equatorial convectional air currents (Statement-II) are the precise physical mechanism that lofts the air upward and forces the upper tropopause boundary higher (Statement-I), Statement-II provides the correct explanation for Statement-I.

Geography: Statement-I & Statement-II (Assertion-Reason Style) PYQ.

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