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Our Environment Test - 12

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Our Environment Test - 12
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In an ecosystem
    Solution

    The flow of energy is unidirectional. The energy that is captured by the autotrophs does not revert back to the solar input and the energy which passes to the herbivores does not come back to autotrophs. As it moves progressively through the various trophic levels it is no longer available to the previous level.

    So, the correct option is C.

  • Question 2
    1 / -0
    Match the following:
    List 1List 2
    (a)Fourth trophic level(i)Snake
    (b)Second trophic level(ii)Vulture
    (c)First trophic level(iii)Rabbit
    (d)Third trophic level(iv)Grass

    Solution
    At first trophic level is grass (producer).
    At the second trophic level is rabbit (eats grass - primary consumer).
    At the third trophic level is snake (eats rabbit - secondary consumer).
    At the fourth trophic level is vulture (eats snake - tertiary consumer).
    Thus, the correct answer is D.
  • Question 3
    1 / -0
    Ozone hole means
    Solution
    • Due to the depletion of stratospheric ozone, a seasonal hole in the ozone layer at polar regions is formed in the atmosphere. This is known as the ozone hole. 
    • The depletion of ozone causes harmful UV rays to reach the earth. UV radiations are responsible for causing skin cancers and various diseases in humans.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    The first link in any food chain is always a green plant, because
    Solution
    In all the ecosystems, the sun is the ultimate source of energy. Green plants trap solar energy and convert it into a usable form, which can be used by other organisms at successive trophic levels. Thus, the correct answer is option C.
  • Question 5
    1 / -0
    The transfer of energy from one organism to another organism in a natural community establishes:
    Solution
    A food chain is defined as the linear sequence of transfer of matter and energy in the form of food from one organism to another in an ecosystem.
    So, the correct answer is option 'A'.    
  • Question 6
    1 / -0
    The consumers are
    Solution
    According to the mode of nutrition, all living organisms can be classified into producers (herbivores) and consumers (carnivores and omnivores). 
    Consumers are organisms that eat plants and small animals. 
    They may be primary consumers that feed on plants,
    Secondary consumers that feed on primary consumers and
    Tertiary consumers that feed on secondary consumers.
    Plants are producers while microbes are decomposers.
    Therefore, the correct answer is 'all animals'.
  • Question 7
    1 / -0
    Energy and nutrients enter a community by 
    Solution
    In any ecosystem, producers occupy the first trophic level. The producers trap solar energy and convert its light energy into biologically useful organic compounds like sugars. Thus, green plants also act as energy converters. They convert light energy of the sun into chemical energy of sugars. The sugars synthesized by the producers are consumed by herbivores and herbivores are consumed by carnivores. In this manner, green plants are the source of energy and nutrients to all the organisms in an ecosystem.
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Which of the following belongs to the category of primary consumers?
    Solution
    • The consumers in an ecosystem are heterotrophs, mostly animals that feed on other organisms. 
    • Consumers can be first-order consumers, e.g., herbivores like cattle, rabbit, deer, and grasshoppers, etc. They feed on producers. 
    • Primary carnivores are second-order consumers. They feed on herbivores. 
    • Snakes, eagles, and water insects like scavenger beetles are tertiary consumers as they feed on secondary consumers as snakes feed on frogs, eagles feed on different animals like rabbits, birds, and fishes while scavenger beetles feed on tadpoles and small fish during the larval stage.

    Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Ecosystem is defined as:
    Solution
    • A complex interaction between all the living (plants, animals, microorganisms) and the physical components (light, water, temperature, soil, etc) constitutes an ecosystem. 
    • An ecosystem thus has two types of components known as biotic (living) and abiotic (physical). 
    Thus, the ecosystem represents the interaction between the biotic and abiotic components.
  • Question 10
    1 / -0
    In an ecosystem, primary consumers are:
    Solution
    In an ecosystem, green plants are the producers. Herbivores are primary consumers. They feed on producers. Carnivores are secondary consumers. They feed on primary consumers. Decomposers aid in the decomposition of dead remains of producers and consumers.
    Thus, the correct answer is option B.
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