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Our Environment Test - 28

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Our Environment Test - 28
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Weekly Quiz Competition
  • Question 1
    1 / -0
    If a grassland food chain is linked to the food chain in the forest. It can be termed as
    Solution
    The interlink of two or more food chains form a food web.
    Thus, if a grassland food chain and forest food chain overlap, they form a food web.
  • Question 2
    1 / -0
    A food chain can have trophic levels:
    Solution
    • Food chain in an ecosystem is defined as the passage of food from one trophic level to the next higher trophic level. 
    • A food chain can have 3 or 4 trophic levels. 
    • Plants are producers which are present in first trophic level. 
    • Primary consumers are second trophic levels which eat plants. They are herbivores. 
    • Secondary consumer are present make third trophic level. They eat primary consumers and are carnivores. 
    • Tertiary or top consumer make fourth trophic level. They are carnivores
    • Thus, the correct answer is option A- 'Three or four.'
  • Question 3
    1 / -0
    By which of the following phenomena DDT could be accumulated in the human beings:
    Solution
    DDT is a compound that was used as an insecticide. It is highly stable and does not degrade. Due to this property, it enters the food chain and is accumulated at each trophic level. The organisms at the higher trophic levels will have an increased concentration of DDT. This process is called biomagnification.
    Hence, the correct answer is 'Biomagnification.'
  • Question 4
    1 / -0
    Food web refers to:
    Solution
    Food web refers to connected feeding patterns in a biotic community. It is constituted by the various interlinked food chains in a community. 
    Thus, the correct answer is option D.

  • Question 5
    1 / -0
    When a man eats fish that feeds on zooplankton which has eaten small plants; the producer in the chain is:
    Solution
    A food chain is series of plants/animals which are interrelated in the form of organisms being eaten as food by the other. In the given chain, the producer is small plants. Zooplankton is a primary consumer which feeds on small plants. It is an herbivore. Fish is a secondary consumer which feeds on zooplankton. It is a carnivore. Man is a tertiary consumer who feeds on fish. It is a carnivore.
    Thus, the correct answer is 'Small plants.' 
  • Question 6
    1 / -0
    Sidartha found a vegetarian field mouse being swallowed by snake which in turn formed the meal for a hawk. What is the position of snake in the food chain?
    Solution
    A food chain is series of plants/animals which are interrelated in the form of organism being eaten as food by the other. Grass is a primary producers in a food chain. Mouse is a primary consumer in a food chain which eats plants. Snake is a secondary consumer which eats mouse. Hawk is a tertiary consumer in a food chain which eats snake.
    Thus, the correct answer is 'Secondary consumer.'

  • Question 7
    1 / -0
    Proper management of natural resources ensures 
    Solution
    • Natural resource management refers to the management of natural resources such as land, water, soil, plants, and animals, with a particular focus on how management affects the quality of life for both present and future generations (stewardship)
    • Hence proper management of natural resources ensures equitable distribution of natural resources and sustainable development.
    • So, the correct answer is 'Both A and B'.
  • Question 8
    1 / -0
    Animal dung is ______ waste.
    Solution
    Animal dung can be easily degradable by microorganisms. Thus, it is a Biodegradable waste.
    Option A is correct.
  • Question 9
    1 / -0
    Loss of energy from one trophic level to next higher trophic level is:
    Solution
    According to 10% law, 10% of energy is transferred from one trophic level to the next successive trophic level. The rest of the energy, that is 90% of energy is lost during the transfer of energy from one trophic level to the next higher trophic level. The first trophic level has the maximum energy. 
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Pollution caused by pesticides is more hazardous to:
    Solution
    Biomagnification refers to the increase in the concentration of non-degradable pollutants (for example, pesticides) or toxic substances at successive trophic levels in a food chain. This happens when a toxic substance consumed by the organisms of a trophic level cannot be metabolized. When these organisms are consumed by the organisms of higher trophic levels, the toxic substance is passed on to the next higher trophic level. The amount of the toxic substance thus keeps on increasing in successive trophic levels. Since the trophic level of top carnivores is at the fourth level, they will have the highest amount of these toxic substances.
    Hence, the correct answer is D.
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