Which of the following pairs of excretory substances are removed from the blood during the Ornithine cycle?

  • A
    $CO_2$ and Urea
  • B
    Ammonia and Urea
  • C
    $CO_2$ and Ammonia
  • D
    Urea and Sodium salts

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What are excretory substances?

Uric acid is formed in humans from:

Fill in the gaps:
$A$ healthy adult human excretes (on an average) ............ $gm$ of urea/day.

Which of the following is both an osmoregulator as well as a nitrogenous product?

The yellow colour of urine is due to the presence of

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