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Question

Almost all the aquatic animals excrete ammonia as the nitrogenous waste product. Which of the following statements is not in agreement with this situation?

A
Ammonia is easily soluble in water
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B
Ammonia is released from the body in a gaseous state
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C
Ammonia is highly toxic and needs to be eliminated as and when formed
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D
Ammonia gets converted into a less toxic form called urea
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Solution

The correct option is B Ammonia is released from the body in a gaseous state

Ammonia is easily soluble in water, therefore, aquatic animals with high access to water can easily excrete their nitrogenous wastes as ammonia. So statement A is in complete agreement with the scenario.
Ammonia is highly toxic, and needs to be eliminated immediately. Having a ready access to water ensures immediate elimination of ammonia, and therefore, statement C also supports the given scenario.
Ammonia is converted to a less toxic form called urea by animals that do not have ready access to water, that is land animals, so that they can store it for a while and release it at a more opportune time. Thus, statement D is also in agreement with the given situation.
However, if ammonia could indeed be released in a gaseous state, then it would have been easy for terrestrial animals to eliminate ammonia by breathing it out, and conversely, quite difficult for aquatic animals to do so, but that is not true. Therefore the statement B is not in agreement with the situation.


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