Ecosystem MCQ Questions and Answers Quiz

31. The Primary Consumers are also called as

  1. Herbivores
  2. Carnivores
  3. Enzymes
  4. None of these

32. Green plants are absent in deep sea. Why?

  1. Light is absent
  2. High pressure
  3. Low temperature
  4. Great depth

33. Gas released during photosynthesis is

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

34. What is Plankton?

  1. Microscopic floating organisms – Plants and animals.
  2. bottom dwelling aquatic organisms
  3. large plants in water
  4. none

35. The area to which a species is biologically adapted to live is known as ............................

  1. Niche
  2. Habitat
  3. Succession
  4. Community

36. The source of atmospheric oxygen is

  1. Nitrogen cycle
  2. Green Plants
  3. Water
  4. Carbon Cycle

37. Nitrogen gas returns to the atmosphere by the action of

  1. Nitrogen fixing bacteria
  2. Denitrifying bacteria
  3. Nitrifying bacteria
  4. Nitrate fertilizers

38. Which is an example for sedimentary biogeochemical cycle

  1. Oxygen cycle
  2. Nitrogen cycle
  3. Water cycle
  4. Phosphorus cycle

39. North American grassland are called

  1. Pampas
  2. Prairies
  3. Savannah
  4. None

40. An example of an abiotic component

  1. Plants
  2. Soil
  3. Animals
  4. Bacteria
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