Environmental Studies MCQ Questions and Answers Quiz

21. Lowest layer of atmosphere is called

  1. Thermosphere
  2. Stratosphere
  3. Troposphere
  4. Mesosphere

22. Major cause of increment in population growth

  1. decrease in birth rate
  2. decrease in mortality rate
  3. illiteracy
  4. none of the above

23. Most stable ecosystem is

  1. Forest
  2. Desert
  3. Ocean
  4. Mountain

24. Nitrogen gets oxidized into

  1. Nitrates and ammonia
  2. Ammonia and urea
  3. Urea and nitrite
  4. Nitrates and nitrites

25. Noise is measured using sound meter and the unit is

  1. Hertz
  2. Decibel
  3. Joule
  4. Sound

26. Nutrients are recycled in ecosystem by

  1. Biogeochemical cycle
  2. Energy flow
  3. Producers
  4. Consumers

27. Region where fresh water meets salt water is called

  1. Sea
  2. Lake
  3. River
  4. Estuarine

28. Sequence of eating and being eaten in a ecosystem is called

  1. Food web
  2. Natural cycle
  3. Ecological Pyramid
  4. Food chain

29. Study of trends in human population growth and prediction of future growth is called

  1. Demography
  2. Biography
  3. paleography
  4. psychology

30. The concentration of which gas is highest in our environment?

  1. Oxygen
  2. Hydrogen
  3. Nitrogen
  4. Carbon dioxide
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