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Our Environment Test - 31

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Our Environment Test - 31
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is non-essential in an ecosystem:-
    Solution
    A) $$CO_2$$ is essential for the plants to photosynthesize.
    B) Grass is the source of food for maximum number of grazing animals.
    C) Fungi decompose the dead and decayed organisms to give inorganic substances which nourish the soil and provide nutrients to plants.
    Since all three are correct, the correct answer is 'None of the above'. 
  • Question 2
    1 / -0
    How much of the Earth's surface is covered with water?
    Solution
    Earth's surface if covered by 70% of water which includes oceans, seas and fresh water bodies while the left 30% is land.
    The correct option is A.
  • Question 3
    1 / -0
    The trophic level of lion in a forest ecosystem is:
    Solution
    Since a lion is a secondary consumer as it survives by feeding on the organism from the primary consumers.
    Hence, the trophic level of a lion in a forest ecosystem is $$T_3$$.
  • Question 4
    1 / -0
    The producers derive energy either from sunlight or
  • Question 5
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    The study of food chains and food webs is observed in the phenomenon known as
    Solution

    All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem.

    Food chain and food web are the relationships among various organisms for food which are a part of the ecosystem. 

  • Question 6
    1 / -0
    Which organisms are dependent on the producers for their food ?
    Solution
    Heterotrophs are primary consumers which are dependent on the producers, the autotrophs for their food. For example - goats, rabbits, cows, and humans.
  • Question 7
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    Example of biotic factors includes:
    Solution
    Water, sunlight and oxygen are non-living and physical features of an ecosystem and are thus the 'abiotic factors'.
    The grass is living. Thus, the grass is a 'biotic' factor.
    Thus, the correct option is D.
  • Question 8
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    Directions For Questions

    Answer question on the basis of your understanding of the following paragraphs and the related studied concepts.  
    Human body is made up of five important components, of which water is the main component. Food as well as potable water are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradable, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.

    ...view full instructions

    Various steps in a food chain represent:
    Solution
    A food chain depicts a linear link of organisms involved in transfer of energy and matter. Each link consists of an organism and is called the trophic level. A single food chain may have three to five trophic levels. The trophic level indicates the mode of nutrition of organism present at that trophic level.
    So, the correct answer is 'Trophic level'
  • Question 9
    1 / -0
    Find incorrect statement for non-biodegradable pollutants.
    Solution
    • Non-biodegradable materials are often synthetic products like plastic, glass, and batteries. 
    • Because they don't break down easily, if not disposed of properly, non-biodegradable waste can cause pollution, block drains, and harm animals.
    • Non-biodegradable wastes are those that cannot be decomposed or dissolved by microbes or any natural agents. 
    • They remain on earth for thousands of years without any degradation and are often harmful.
    For example, DDT, BHC, plastic, broken glass, etc.
    So, the correct answer is 'the non-biodegradable pollutants are decomposed by microbes'.
  • Question 10
    1 / -0
    Assertion: Ozone is destroyed by CFCs in the upper stratosphere.
    Reason: Ozone hole increases the amount of UV radiation reaching the earth.
    Solution
    The upper stratosphere consists of ozone $$(O_3)$$, which protect us from harmful ultraviolet (UV) radiations coming from the sun.
    When CFC reacts with ozone it breaks the molecule of ozone resulting in ozone layer depletion.
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