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UPSC CDS Physical Geography — practice questions — page 19

Explore 591 free Physical Geography questions in UPSC CDS Geography. Open each question or exercise to read its content, reference answers and available explanation.

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Physical Geography questions and exercises with answers

Showing questions 541–570 of 591.

Organisms very sensitive to sulphur dioxide levels, used as air pollution indicators, are:Read the answer and worked solution →Fresh water is found frozen in the ice-caps at the:Read the answer and worked solution →Terrestrial life-forms need fresh water because their bodies cannot tolerate high amounts of:Read the answer and worked solution →Paper industries release which poisonous substance into water bodies?Read the answer and worked solution →Sudden release of cold water from deep dam reservoirs harms aquatic life by changing:Read the answer and worked solution →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 →The United Nations recommends a minimum of how much water per person per day for drinking, washing and hygiene?Read the answer and worked solution →The UN minimum of 50 litres a day is about how many buckets of water?Read the answer and worked solution →In a few years, what share of the world's people could face water scarcity?Read the answer and worked solution →About what share of the earth's surface is covered with water?Read the answer and worked solution →Water fit for human use is:Read the answer and worked solution →Usable water on earth is roughly what share of all water?Read the answer and worked solution →Water in glaciers, ice caps and permanent snow is:Read the answer and worked solution →Continuous cycling of water among its three forms keeps the total water on earth:Read the answer and worked solution →

Worked practice questions

Organisms very sensitive to sulphur dioxide levels, used as air pollution indicators, are:

  1. Ferns
  2. Algae
  3. Lichens
  4. Mosses
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Correct answer: C. Lichens

1. They grow as a greenish-white crust on bark. 2. Lichens vanish where sulphur dioxide is high. 3. Compare trees near roads and away from them. _Source: syllabus Science, Chapter 14, Natural Resources._

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Fresh water is found frozen in the ice-caps at the:

  1. Hot deserts
  2. Wet tropics
  3. Rainforests
  4. Two poles
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Correct answer: D. Two poles

1. Most surface water is saline sea water. 2. Polar ice-caps hold frozen fresh water. 3. Rivers, lakes and groundwater are also fresh. _Source: syllabus Science, Chapter 14, Natural Resources._

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Terrestrial life-forms need fresh water because their bodies cannot tolerate high amounts of:

  1. Dissolved salts
  2. Dissolved oxygen
  3. Dissolved gases
  4. Fresh minerals
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Correct answer: A. Dissolved salts

1. All cell reactions happen in water. 2. Saline water's dissolved salts cannot be handled. 3. So land life needs accessible fresh water. _Source: syllabus Science, Chapter 14, Natural Resources._

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