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UPSC CSE Soil & Vegetation — practice questions — page 7

Explore 227 free Soil & Vegetation questions in UPSC CSE Geography. Open each question or exercise to read its content, reference answers and available explanation.

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Soil & Vegetation questions and exercises with answers

Showing questions 181–210 of 227.

Rocks crack because the Sun heats them by day and they:Read the answer and worked solution →Which organisms release substances that powder rock surfaces to form the first thin soil layer?Read the answer and worked solution →The bits of decayed living organisms in soil are called:Read the answer and worked solution →The topmost soil layer containing humus and living organisms is the:Read the answer and worked solution →Long-term use of fertilisers and pesticides destroys soil structure by killing:Read the answer and worked solution →Nitrogen-fixing bacteria are most commonly found in the root nodules of:Read the answer and worked solution →During lightning, atmospheric nitrogen is converted into:Read the answer and worked solution →Carbon occurs in elemental form as graphite and:Read the answer and worked solution →The percentage of carbon dioxide in the atmosphere is said to have doubled since the:Read the answer and worked solution →Catch the soil makersRead the answer and worked solution →Pop the water pollutantsRead the answer and worked solution →Run the resource numbersRead the answer and worked solution →Slice the resource wordsRead the answer and worked solution →Abiotic or bioticRead the answer and worked solution →Sort the cyclesRead the answer and worked solution →Type the numberRead the answer and worked solution →Natural resources bingoRead the answer and worked solution →Rotting dead matter in the soil is called:Read the answer and worked solution →Breaking down of rocks by wind, water and climate to form soil is:Read the answer and worked solution →A vertical section through the layers of soil is the:Read the answer and worked solution →The dark, humus-rich uppermost soil layer is the:Read the answer and worked solution →Which soil horizon has less humus but more minerals and is harder and compact?Read the answer and worked solution →The soil layer made of small lumps of rock with cracks and crevices is the:Read the answer and worked solution →The rock from which soil particles were formed is called the:Read the answer and worked solution →Soil with a greater proportion of big particles is:Read the answer and worked solution →Soil in which large and fine particles are in about equal amount is:Read the answer and worked solution →Sandy soils are light, dry and:Read the answer and worked solution →Clayey soils are heavy because they:Read the answer and worked solution →The best topsoil for growing plants is:Read the answer and worked solution →Silt, whose particle size lies between sand and clay, is deposited in:Read the answer and worked solution →

Worked practice questions

Rocks crack because the Sun heats them by day and they:

  1. Melt at noon
  2. Float on water
  3. Turn to sand
  4. Contract at night
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Correct answer: D. Contract at night

1. Parts of a rock expand and contract at different rates. 2. Cooling and contraction at night cause cracks. 3. Water freezing in cracks widens them. _Source: syllabus Science, Chapter 14, Natural Resources._

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Which organisms release substances that powder rock surfaces to form the first thin soil layer?

  1. Lichens
  2. Beetles
  3. Mosses
  4. Ferns
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Correct answer: A. Lichens

1. They grow on bare rock. 2. Lichens powder the rock surface. 3. Moss then grows and breaks it further. _Source: syllabus Science, Chapter 14, Natural Resources._

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The bits of decayed living organisms in soil are called:

  1. Gravel
  2. Humus
  3. Silt
  4. Clay
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Correct answer: B. Humus

1. Soil is a mixture of rock particles and humus. 2. Humus is decayed organic matter. 3. It makes soil porous. _Source: syllabus Science, Chapter 14, Natural Resources._

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