Multiple choice

The main nitrogenous waste of Hydra is :

  1. ammonia only

  2. urea only

  3. uric acid only

  4. both 'a' and 'c'
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A Correct answer
Explanation

The main nitrogenous waste of Hydra is ammonia. Hydra has no organ of excretion, therefore, excretion of waste nitrogenous matter occurs directly by diffusion through cell membrane. 

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