MCQ
upsc-p1-geography-biogeography-soils MCQ - Practice Questions with Answers
Solve 6 upsc-p1-geography-biogeography-soils questions for RAS/RPSC preparation.
Practice questions
Q1With reference to soil fertility and soil productivity, consider the following statements: 1. Soil fertility refers to the nutrient-supplying capacity of soil. 2. Soil productivity excludes management, moisture, crop variety and technology. Which one of the following is correct?
Statement 1 is correct. Fertility is the soil's nutrient-supplying capacity. Productivity is broader and includes management, moisture, crop variety, technology and even market context, so Statement 2 is incorrect.
Q2Consider the following statements about a soil profile: 1. The E horizon is leached in many humid soils. 2. The B horizon may accumulate clay, iron or salts. 3. The C horizon is unweathered bedrock. Which of the statements given above are correct?
Statements 1 and 2 are correct. Leaching characterises the E horizon in many humid soils, while clay, iron or salts can accumulate in the B horizon. The C horizon is weathered parent material; unweathered bedrock is the R horizon.
Q3Arrange the following soil horizons from the surface downward: 1. A horizon 2. B horizon 3. O horizon 4. E horizon Select the correct answer using the code given below.
Where all four horizons are present, organic litter forms the surface O horizon, followed by humus-rich A, leached E and the accumulation horizon B. Thus the order is O-A-E-B, or 3-1-4-2.
Q4Consider the following statements about natural vegetation: 1. Mangroves occur on tidal, saline and muddy coasts and deltas. 2. Every grassland in India is a degraded forest. 3. Montane vegetation can change sharply with altitude. Which of the statements given above are correct?
Statements 1 and 3 are correct. Mangroves are salt-tolerant forests of tidal muddy coasts, and montane belts change with altitude. India also has natural grasslands, so treating every grassland as degraded forest is an ecological error.
Q5Arrange the following Himalayan vegetation belts in their general order from lower to higher altitude: 1. Alpine vegetation 2. Subtropical forests 3. Subalpine vegetation 4. Broadleaf and coniferous forests Select the correct answer using the code given below.
Lower Himalayan slopes generally carry subtropical forests. Middle elevations support broadleaf and coniferous forests, above which vegetation shifts to subalpine and then alpine belts. The order is therefore 2-4-3-1.
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6Consider the following statements about world biomes: 1. Tropical rainforest combines rapid nutrient cycling with strongly leached soils. 2. Tropical savanna has distinct wet and dry seasons. 3. Tundra is characterised by permafrost and tall coniferous trees. Which of the statements given above are correct?