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Q1Geography·Soils, Biomes and Natural RegionsPYQ 2023
Consider the following statements:
Statement-I: The soil in tropical rain forests is rich in nutrients.
Statement-II: The high temperature and moisture of tropical rain forests cause dead organic matter in the soil to decompose quickly.
Which one of the following is correct in respect of the above statements?
- ABoth Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I
- BBoth Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I
- CStatement-I is correct but Statement-II is incorrect
- DStatement-I is incorrect but Statement-II is correctCorrect
Explanation
Correct. Tropical rain forest soils are nutrient-poor despite high biomass productivity because intense leaching removes minerals faster than they can accumulate. Statement-II is correct as warm, humid conditions do accelerate decomposition.
Why the other options are incorrect
- Option A
Statement-I is incorrect. Despite rapid decomposition, heavy leaching by abundant rainfall washes nutrients away before they accumulate in the soil.
- Option B
Statement-I is incorrect. Tropical rain forest soils are notoriously nutrient-poor because nutrients released by decomposition are immediately absorbed by vegetation or leached away.
- Option C
Statement-II is correct. High temperatures and moisture accelerate microbial activity, causing rapid decomposition of organic matter on the forest floor.
Q2Geography·Soils, Biomes and Natural Regions
Consider the following statements about 'permafrost':
1. It refers to ground that remains frozen for at least two consecutive years.
2. The active layer above permafrost thaws in summer and freezes again in winter.
3. Permafrost is found exclusively in Antarctica.
Which of the statements given above is/are correct?
- A1 and 2 onlyCorrect
- B1 only
- C2 and 3 only
- D1, 2 and 3
Explanation
Correct. Permafrost is defined as ground frozen for two or more consecutive years, and the active layer above it undergoes seasonal freeze-thaw cycles. Permafrost is not exclusive to Antarctica; it is widespread in the Arctic (Siberia, Canada, Alaska) and at high altitudes.
Why the other options are incorrect
- Option B
Statement 2 is also correct. The active layer is crucial for tundra ecosystems as it provides the only zone available for plant roots and biological activity.
- Option C
Statement 3 is incorrect. Most of the world's permafrost is in the Northern Hemisphere Arctic regions.
- Option D
Statement 3 is wrong. Permafrost covers vast areas of Siberia, Canada, Alaska, and Greenland in addition to Antarctica.
Q3Geography·Soils, Biomes and Natural Regions
What is the primary reason why the eastern margins of continents in the tropics do not develop deserts, unlike the western margins?
- AEastern margins receive warm ocean currents that increase moisture availabilityCorrect
- BEastern margins are at higher altitudes, causing orographic rainfall
- CEastern margins are closer to the poles and receive more precipitation
- DEastern margins have more volcanic activity, releasing water vapour
Explanation
Correct. The eastern margins of tropical continents receive warm ocean currents (e.g., Brazil Current, Mozambique Current) that bring moisture onshore, supporting rainfall and preventing desert conditions. Western margins, by contrast, have cold offshore currents that suppress rainfall.
Why the other options are incorrect
- Option B
There is no general rule that eastern margins are at higher altitudes. The key difference is oceanic influence.
- Option C
Eastern and western margins at the same latitude are equidistant from the poles. The difference is driven by ocean currents and pressure systems.
- Option D
Volcanic activity is not a significant factor in continental-scale rainfall patterns.
Q4Geography·Soils, Biomes and Natural Regions
The equatorial climate natural region is characterized by:
1. Convectional rainfall almost daily, often in the afternoon
2. Very small annual temperature range but significant diurnal range
3. Location between 5°N and 5°S latitude
Which of the statements given above are correct?
- A1 and 2 only
- B1 and 3 only
- C2 and 3 only
- D1, 2 and 3Correct
Explanation
Correct. The equatorial region features daily convectional storms, minimal annual but notable diurnal temperature ranges, and lies close to the equator, typically within 5° latitude.
Why the other options are incorrect
- Option A
Statement 3 is also correct. The equatorial climate zone lies within roughly 5° on either side of the equator.
- Option B
Statement 2 is also correct. With the sun nearly overhead year-round, annual temperature variation is minimal (typically 2-3°C), but day-night variation can be 5-8°C.
- Option C
Statement 1 is also correct. Intense daytime heating causes convective uplift, leading to heavy afternoon thunderstorms as a near-daily phenomenon.
Q5Geography·Soils, Biomes and Natural Regions
Consider the following statements about loess soils:
1. They are fine-grained wind-deposited soils.
2. They are extremely fertile due to their mineral-rich composition.
3. The Loess Plateau of China and parts of the Mississippi Valley are major loess deposits.
Which of the statements given above are correct?
- A1 and 2 only
- B2 and 3 only
- C1 and 3 only
- D1, 2 and 3Correct
Explanation
Correct. Loess is a wind-deposited, silt-sized sediment that forms fertile soils. Major deposits include the Chinese Loess Plateau (the world's largest), the Mississippi-Missouri valley, and parts of Central Europe.
Why the other options are incorrect
- Option A
Statement 3 is also correct. The Chinese Loess Plateau and the American Midwest are among the world's most significant loess deposits.
- Option B
Statement 1 is also correct. Loess is aeolian (wind-deposited) sediment composed of silt-sized particles.
- Option C
Statement 2 is also correct. Loess soils are mineral-rich and support intensive agriculture in many regions.
Q6Geography·Soils, Biomes and Natural Regions
With reference to the USDA Soil Taxonomy, the soil order 'Oxisol' is characterized by:
- AHigh content of organic matter in cold regions
- BExtreme weathering and dominance of iron and aluminium oxides in tropical regionsCorrect
- CSwelling and cracking clay in semi-arid regions
- DPresence of permafrost within 2 meters of the surface
Explanation
Correct. Oxisols are the most weathered soils on Earth, found predominantly in tropical and subtropical regions. They are dominated by iron and aluminium oxide minerals (kaolinite, gibbsite, goethite) due to intense and prolonged chemical weathering.
Why the other options are incorrect
- Option A
High organic matter content in cold regions characterizes Histosols (peat soils) or Gelisols, not Oxisols.
- Option C
Swelling and cracking clay soils are Vertisols, not Oxisols.
- Option D
Soils with permafrost within 2 meters are classified as Gelisols, not Oxisols.
Q7Geography·Soils, Biomes and Natural Regions
The 'O-horizon' in a soil profile primarily consists of:
- APartially weathered parent rock material
- BUndecomposed and partially decomposed organic matter on the surfaceCorrect
- CA zone of illuviation rich in clay and iron
- DUnweathered bedrock
Explanation
Correct. The O-horizon (organic horizon) lies at the very surface and consists of leaf litter, twigs, and other organic debris in various stages of decomposition. It is most prominent in forest soils.
Why the other options are incorrect
- Option A
Partially weathered parent rock material constitutes the C-horizon, not the O-horizon.
- Option C
The zone of illuviation rich in clay and iron is the B-horizon.
- Option D
Unweathered bedrock is the R-horizon (or parent rock layer) at the bottom of the soil profile.
Q8Geography·Soils, Biomes and Natural Regions
The Mediterranean biome is characterized by:
- AHot, dry summers and mild, wet wintersCorrect
- BUniformly distributed rainfall throughout the year
- CExtremely cold winters with heavy snowfall
- DYear-round high humidity and rainfall exceeding 250 cm
Explanation
Correct. The Mediterranean climate is distinctive for its dry, warm-to-hot summers and cool, wet winters. This pattern results from the seasonal shifting of subtropical high pressure and westerly wind belts.
Why the other options are incorrect
- Option B
Uniform rainfall distribution characterizes equatorial and some oceanic climates, not the Mediterranean biome with its marked dry summer.
- Option C
Extremely cold winters with heavy snowfall describe continental or subarctic climates, not the mild Mediterranean climate.
- Option D
Year-round high humidity and excessive rainfall characterize tropical rainforest regions, not the Mediterranean biome.
Q9Geography·Soils, Biomes and Natural Regions
The vegetation of the tundra biome primarily consists of:
- ATall coniferous trees with needle-like leaves
- BBroad-leaved deciduous trees that shed leaves in winter
- CMosses, lichens, sedges, and dwarf shrubsCorrect
- DThorny bushes and succulent plants
Explanation
Correct. Tundra vegetation is low-growing and adapted to extreme cold, short growing seasons, and permafrost. Mosses, lichens (including reindeer moss), sedges, and dwarf willow and birch are the characteristic plants.
Why the other options are incorrect
- Option A
Tall coniferous trees characterize the taiga (boreal forest) biome, not the treeless tundra.
- Option B
Broad-leaved deciduous trees are found in temperate forests at lower latitudes, not in the tundra.
- Option D
Thorny bushes and succulents are adapted to hot desert and semi-arid conditions, not the cold tundra.
Q10Geography·Soils, Biomes and Natural Regions
Which of the following correctly describes the concept of 'climatic climax vegetation'?
- AVegetation that has been recently planted and is yet to mature
- BThe final stable plant community that develops in equilibrium with the prevailing climateCorrect
- CVegetation that grows only during the rainy season and disappears during drought
- DAny vegetation community that is dominated by a single plant species
Explanation
Correct. Climatic climax vegetation is the theoretical endpoint of ecological succession, where the plant community reaches a stable equilibrium with the regional climate. Without disturbance, it persists indefinitely.
Why the other options are incorrect
- Option A
Planted vegetation is artificial and does not represent a climatic climax community.
- Option C
Seasonal vegetation that appears and disappears represents an early successional stage or ephemeral community, not a climax state.
- Option D
A single-species community (monoculture) does not define climatic climax. Climax communities are often highly diverse.
Q11Geography·Soils, Biomes and Natural Regions
Consider the following pairs:
Grassland Type — Region
1. Campos — Brazil
2. Canterbury — New Zealand
3. Puszta — Hungary
Which of the pairs given above is/are correctly matched?
- A1 only
- B1 and 3 only
- C2 and 3 only
- D1, 2 and 3Correct
Explanation
Correct. Campos are Brazilian grasslands, the Canterbury Plains are New Zealand grasslands, and the Puszta is the great grassland plain of Hungary.
Why the other options are incorrect
- Option A
Pairs 2 and 3 are also correct. Canterbury Plains of New Zealand and the Puszta of Hungary are well-known grassland regions.
- Option B
Pair 2 is also correct. The Canterbury Plains in New Zealand's South Island are a significant grassland region.
- Option C
Pair 1 is also correct. Campos are the tropical and subtropical grasslands of Brazil.
Q12Geography·Soils, Biomes and Natural Regions
The 'selva' type of natural region corresponds to which of the following?
- ATemperate deciduous forest
- BTropical evergreen rainforestCorrect
- CMediterranean woodland
- DBoreal coniferous forest
Explanation
Correct. 'Selva' is the term used for the tropical evergreen rainforest, particularly associated with the Amazon basin. It refers to the dense, multi-layered, species-rich forest of equatorial regions.
Why the other options are incorrect
- Option A
Temperate deciduous forests are found in mid-latitudes and are not called selva.
- Option C
Mediterranean woodland has its own distinct classification and is not referred to as selva.
- Option D
Boreal coniferous forest is known as taiga, not selva.