Excretory Products and their Elimination


  1. Removal of proximal convoluted tubule from the nephron will result in:









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    Gnerally all of the essential nutrients and 70% to 80% of electrolytes and water are reabsorbed by this segment. Removal of proximal convolnted tubule from the nephron will result in dilution of urine.

    Correct Option: D

    Gnerally all of the essential nutrients and 70% to 80% of electrolytes and water are reabsorbed by this segment. Removal of proximal convolnted tubule from the nephron will result in dilution of urine.


  1. Uric acid is nitrogenous waste in









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    The excretion of uric acid as nitrogenous waste is called uricotelism. The excretion of uric acid is advantageous for those animals which have to conserve water for their survival like birds and lizards.

    Correct Option: B

    The excretion of uric acid as nitrogenous waste is called uricotelism. The excretion of uric acid is advantageous for those animals which have to conserve water for their survival like birds and lizards.



  1. Select the option which shows correct matching of animal with excretory organs and excretory product









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    Salamander (Amphibia; Caudata) excrete urea through kidneys (mesonephric).

    Correct Option: C

    Salamander (Amphibia; Caudata) excrete urea through kidneys (mesonephric).


  1. In Ornithine cycle, which one pair of the following wastes are removed from the blood?









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    In ureotelic animals urea is formed from ammonia by Ornithine cycle.
    CO2 + 2NH3 → CO(NH2)2 + H2O
    ammonia Urea

    Correct Option: B

    In ureotelic animals urea is formed from ammonia by Ornithine cycle.
    CO2 + 2NH3 → CO(NH2)2 + H2O
    ammonia Urea



  1. Which one of the following statements is correct with respect to kidney function regulation?









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    When some one drinks lots of water, kidney release of ADH is suppressed.

    Correct Option: A

    When some one drinks lots of water, kidney release of ADH is suppressed.