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Our Environment Test - 27

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Our Environment Test - 27
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Based on the food chain, pick the odd one out.
    Solution
    In the list of options given below, Plants are the odd ones because they are the only ones in the list that are producers. Grasshopper is a primary consumer which feeds on the plants, the frog and the tiger which feed on other consumers are the secondary and tertiary consumers respectively. Thus, the correct option is A. 
  • Question 2
    1 / -0
    What is the harm from the depletion of Earth's ozone layer?
    Solution
    The ozone layer is responsible for most of the absorption of harmful UV rays. Depletion of the ozone layer allows the harmful UV rays to enter the Earth's surface causing various damages to the living organisms. Exposure to UV rays can lead to skin cancer, defective eyesight, reduction in immunity, increased number of mutations, and reduction in crop yield.
  • Question 3
    1 / -0
    Which of the following limits the number of trophic levels maintained by an ecosystem?
    Solution
    With each trophic level, only 10% potential energy is transferred and 90% is lost as heat in respiration. The longer the food chain, the lesser is the energy transfer efficiency. To increase the energy transfer efficiency, food chains must be smaller with a limited number of trophic levels. Thus, the correct answer is C.
  • Question 4
    1 / -0
    Which best describes the movement of energy and matter through living systems? 
    Solution
    Energy is passed from one trophic level to the next trophic level. Hence energy flows through successive trophic levels in a food chain. 
    Matter may be organic or inorganic. The organic and inorganic matter is produced, exchanged and moved within the ecosystem and this is called cycling. Hence matter is cycled.
    So, the correct answer is 'Energy flows while matter is cycled'.
  • Question 5
    1 / -0
    Grass $$\rightarrow$$ Goat $$\rightarrow$$ Tiger $$\rightarrow$$ Vulture
    According to the given food chain, which of the following will have the maximum concentration of harmful chemicals in its body due to contamination of pesticides in the soil?
    Solution
    The accumulation of chemicals in living organisms at successive trophic levels is known as biomagnification. When there is excessive use of pesticides or chemicals for the protection of plants against harmful pests, it may lead to its accumulation in the plants. It happens because these pesticides or chemicals are non-biodegradable and they don't metabolize or excrete out from a living organism.
    The plants are eaten by the goat, which is then eaten by the tiger, followed by the vulture. There is a maximum accumulation of the chemicals in the body of the last consumer of the food chain. 
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    In a food chain, deer is eaten by a lion and deer eats the vegetation. Which one of the following given statements is true?
    (P) The lion is a second-order consumer and the deer is the first-order consumer.
    (Q) Lion is a predator and deer is the prey.
    (R) Lion is a first-order consumer and deer is a second-order consumer.
    (S) Lion is a third-order consumer and deer is a second-order consumer.
    Solution
    Every food chain follows a specific order: 
    Producer $$\rightarrow$$ First-order consumer $$\rightarrow$$ Second-order consumer $$\rightarrow$$ Third-order consumer $$\rightarrow$$ Decomposer

    In the given food chain where a deer feeds on producers (vegetation) and lion feeds on the deer, the deer becomes a first-order consumer and the lion is a second-order consumer. Since, the lion feeds on the deer, lion is the predator and the deer is the prey. 
    Thus, the correct answer is option A. 
  • Question 7
    1 / -0
    Waste of water can be minimised by 
    Solution
    Water resources are limited in an ecosystem. There is an urgent need to minimize the waste of water. It can be done by either reuse or recycle of water. Recycling of water can be done by purifying waste water and reusing again for another purpose. The various ways to reuse water is using treated water for toilet flushing, in agriculture, for industrial processes, etc.
    Thus, the correct answer is option A. 
  • Question 8
    1 / -0
    The given image depicts which of the following phenomena?

    Solution

  • Question 9
    1 / -0
    The use of DDT is banned now-a-days because it is
    Solution
    Dichlorodiphenyltrichloroethane is a synthetic insecticide and a non-bio degradable substance which causes environmental pollution. It opens sodium ion channels in neurons, which leads to spasms and eventual death. Due to certain mutational changes in the insects, they become resistant to the DDT.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    If all green plants of the earth are destroyed
    Solution
    If all green plants of earth are destroyed, all animals shall die ultimately. Plants are present in primary trophic level. So, if the primary trophic level is destroyed, energy will not be transferred from primary to secondary trophic level. Eventually, all animals in secondary, tertiary and so on the trophic level will die ultimately.
    Thus, the correct answer is 'All animals shall die ultimately.'
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