SSC Ecology And Environment Sample Paper NCERT Sample Paper-2

  • question_answer
    This pollutant causes burning sensation of throat and eyes and vomiting sensation.

    A)  Hydrogen sulphide

    B)  sulphur

    C)  Hydrogen cyanide

    D)  arsenic substances

    Correct Answer: A

    Solution :

    [a] Hydrogen sulphide is produced in small amounts by some cells of the mammalian body and has a number of biological signalling functions. It acts as an endothelium-derived relaxing factor (EDRF) and as an endothelium- derived hyperpolarizing factor (EDHF). It acts as a relaxant of smooth muscle and as a vasodilator and is also active in the brain, where it increases the response of the NMDA receptor and facilitates long term potentiation, which is involved in the formation of memory. Exposure to lower concentrations can result in eye irritation, a sore throat and cough, nausea, shortness of breath, and fluid in the lungs (pulmonary edema). These effects are believed to be due to the fact that hydrogen sulphide combines with alkali present in moist surface tissues to form sodium sulphide, a caustic. These symptoms usually go away in a few weeks.

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