Our Environment

Subject matter experts of JagranJosh have developed chapter wise practice questions as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Our Environment” of Science.

  • Q1.Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?

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  • Q2.The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:

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  • Q3.Which of the following may be a conclusion of the excessive exposure of humans to sun’s ultraviolet rays?
    i. Peptic ulcers
    ii. Eye disease like cataract
    iii. Damage to lungs
    iv. Skin cancer

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  • Q4.Which among the following is a correct full form for DDT?

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  • Q5.If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:

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  • Q6.Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?

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  • Q7.The substance which is chiefly responsible for the depletion of ozone layer is:

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