2. Sample Papers
  3. SSC
  4. Ecology And Environment

SSC Ecology And Environment Sample Paper NCERT Sample Paper-1

  • question_answer
    Knock knee disease is due to

    A) Hormonal imbalance

    B) Genetical abnormality in males

    C) Deficiency in tyrosine amino acid

    D) Excess fluoride concentration in water body

    Correct Answer: D

    Solution :

    Due to the accumulation of excess fluoride in body through contaminated water, body of a person suffers from stiff joint. It is called knock knee disease.


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