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Biotic Components of Ecosystem Test - 2

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Biotic Components of Ecosystem Test - 2
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Weekly Quiz Competition
  • Question 1
    1 / -0
    All living organisms on Earth constitute
    Solution
    All living organisms on Earth constitute a biosphere.The biosphere includes all living organisms on earth, together with the dead organic matter produced by them.
  • Question 2
    1 / -0
    The element needed to reduce nitrate to nitrite is
    Solution
    Moybdenum is responsible for reduction of nitrate to nitrite ion.
  • Question 3
    1 / -0
    Biodegradable wastes can usually be converted into useful substances with the help of
    Solution
    Heterotrophic bacteria use organic compounds as a source of energy and carbon. Biodegradable wastes can usually be converted into useful substances with the help of heterotrophic bacteria.
  • Question 4
    1 / -0
    Which of the following is an example of mutualism?
    Solution
    A lichen is a composite organism that emerges from algae or cyanobacteria (or both), living among filaments of a fungus in a mutually beneficial (symbiotic) relationship.
    Options 1, 3 and 4 are the examples of commensalism, parasitism and predation, respectively.
  • Question 5
    1 / -0
    In a forest, the following 4-step food chain operates:

    Grass Insect Frog Bird

    Which of the following organisms can be classified as a primary carnivore on the basis of this food chain?
    Solution
    In the given food chain, grass is a producer, insect is a herbivore and frog is a primary carnivore.
  • Question 6
    1 / -0
    Which of the following options is true about producers in food chain?
    Solution
    Producers are green plants which utilise sunlight, water and carbon dioxide to form carbohydrates. Thus, producers convert inorganic substances into organic ones.
  • Question 7
    1 / -0
    A food chain will not begin in the absence of
    Solution
    The green plants or autotrophs synthesise their own food, i.e. they are producers. Since they convert light energy into chemical energy, a food chain won't start in their absence.
  • Question 8
    1 / -0
    Green plants form the
    Solution
    Green plants or the producers constitute the first trophic level as they are the producers.
  • Question 9
    1 / -0
    Consider the food pyramid given below showing the interdependence of plants and animals in the food chain.
    Which of the following options in the pyramid is the most delicately balanced in the chain?

    Solution
    Top carnivores are the most delicately balanced in the given food chain.
  • Question 10
    1 / -0
    Which of the following options strongly threatens biodiversity?
    Solution
    Destruction of natural habitats and vegetation and shifting cultivation strongly threatens biodiversity.
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