SSC Ecology And Environment Sample Paper NCERT Sample Paper-2

  • question_answer
    The reason for global warming is

    A)  Long wavelength radiation are absorbed by the atmosphere

    B)  Short wavelength radiation are-absorbed by the atmosphere

    C)  Atmosphere traps radiations to increase the temperature

    D)  UV and infrared radiations

    Correct Answer: A

    Solution :

    [a] Greenhouse gases, such as methane \[(C{{H}_{4}}),\]nitrous oxide \[({{N}_{2}}O),\] water vapour \[({{H}_{2}}O)\] and carbon dioxide \[(C{{O}_{2}}),\] absorb certain wavelengths of OLR adding heat to the atmosphere, which in turn causes the respective absorbing layer of the atmosphere to emit more radiation. Some of this radiation is directed back towards the Earth, increasing the average temperature of the Earth's surface. Therefore, an increase in the concentration of a greenhouse gas would contribute to global warming by increasing the amount of radiation that is absorbed and emitted by these atmospheric constituents.

You need to login to perform this action.
You will be redirected in 3 sec spinner