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Our Environment Test - 18

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Our Environment Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Select the mismatched pair in the following.
    (a) Biomagnification- Accumulation of chemicals at the successive trophic levels of a food chain.
    (b) Ecosystem- Biotic components of the environment.
    (c) Aquarium- A man-made ecosystem.
    (d) Parasites- Organisms which obtain food from other living organisms.
    Solution
    • Biomagnification: It is also known as biological magnification, occurs when the concentration of a substance, such as DDT or mercury, in an organism, exceeds the background concentration of the substance in its diet. 
    • Ecosystem: An ecosystem is a community of living organisms in conjunction with the non-living components of their environment (things like air, water, and mineral soil), interacting as a system.
    • Aquarium - It is a transparent tank of water in which live fish and other water creatures and aquatic plants are kept. It is an example of a man-made ecosystem.
    • Parasite - A parasite is an organism that lives in or on another organism (its host) and benefits by deriving nutrients at the other's expense.
    Therefore, the correct answer is option B.
  • Question 2
    1 / -0
    Food web ensures survival of all types of trophic levels.
    Solution
    Food web is a mesh like network of food chains which are interconnected. In a food web, an organism occupies more than one trophic level. It feeds on the organisms of lower trophic levels and is also eaten by other organisms of higher trophic levels. Thus all organisms at different trophic levels get food in a food web which ensures their survival. 
    Hence, the statement given in the question is correct.
    So, the correct answer is 'True'.
  • Question 3
    1 / -0
    Biodegradable wastes should be separated and kept in which coloured bin for garbage collectors?
    Solution
    • Wastes that can be decomposed by the action of microbes are called biodegradable wastes. Kitchen wastes like vegetable and fruit peels are considered wet waste and hence, can be separated and kept in green-colored bins for garbage collectors. 
    • Blue dustbins are used for the disposal of plastic materials like wrappers, packing plastics, bottles, cans, etc. These are non-biodegradable wastes. 
    • Yellow dustbins are used for disposing of papers and glass bottles. These can be recycled and reused.
    • Red color bins are used for disposing of biowaste like bandages, diapers, etc, 

    So, the correct answer is option A.
  • Question 4
    1 / -0
    Not all materials are recycled in the environment.
    Solution
    Many elements are recycled in nature through biogeochemical cycles. For example, carbon, hydrogen, nitrogen, sulphur etc. Biogeochemical cycles are also known as nutrient cycles. Through these cycles, there is exchange or circulation of nutrients between biotic and abiotic components of biosphere. The elements are provided to organisms by the earth and after their death and decay, the elements are returned to earth again.However, plastics, glass, synthetic fibres etc are not recycled in the environment
    Hence, the statement given in the question is correct.
    So, the correct answer is 'True'
  • Question 5
    1 / -0
    The food web consists of:
    Solution
    The food chain is the order of events in an ecosystem, where one organism eats another and gets eaten by the other. Producers, consumers and decomposers make up a food chain. The food web is an interconnected network of many food chains. As multiple interconnecting food chains form a food web, therefore a food web also consists of producers, consumers and decomposers.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    An example of a producer in the aquatic food web would be
    Solution
    Producers are the green plants which convert light energy into chemical energy and prepare their own food. They are autotrophic component of an ecosystem. They are green plants and are photosynthetic. Their kind varies with the type of ecosystem. In an aquatic ecosystem, producers will be aquatic plants. For example, Duckweed also known as water lenses. These are flowering aquatic plants which keep floating on the surface of water. Since these plants are photosynthesising, they are producers in an aquatic food web.
    So, the correct answer is 'Duckweed'.
  • Question 7
    1 / -0
    Each step in a food chain is called
    Solution
    A. Trophic level is the position of an organism that it occupies in a food chain. Simply, trophic level is each step in a food chain representing producers and consumers.
    B. Consumer levels represent heterotrophs that feed on producers and occupy higher trophic levels in a food chain.
    C. Food web is an interconnected network of food chains.
    D. Producers are the green plants that convert light energy into chemical energy and prepare their food. 
    So, the correct answer is 'trophical level'.
  • Question 8
    1 / -0
    Which type of waste is represented by the given figure?

    Solution
    • Decomposers play the main role in recycling the elements in the environment. They release enzymes to break down complex substances into simple substances. 
    • The energy released in this process is utilized by decomposers. The things which can be degraded by decomposers are termed as 'bio-degradable'. 
    • But some human-made things cannot be degraded by decomposers, as they do not possess enzymes to degrade such things. These things are termed as 'non-biodegradable'. These things are plastic, paint, aluminium container, and lead batteries etc. They are not used as compost.
    Therefore, option A is correct. 
  • Question 9
    1 / -0
    Above figures represent.................type of waste.

    Solution
    Wastes which are broken down and disposed off naturally by saprophytes or decomposers are called biodegradable wastes. They are generally organic wastes, e.g., sewage, livestock waste, used tea leaves, waste paper, leather, wood and jute articles, food leftover, etc.
  • Question 10
    1 / -0
    The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about:
    Solution
    The green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls on their leaves and convert it into food energy, which is transferred to further trophic levels.
    Hence, the correct answer is option A. 
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