Assertion: Sharks are categorized as ammonotelic animals.
Reason: Sharks have the ability to retain significant amounts of ammonia in their blood.
Both the assertion and reason are true, and the reason is a correct explanation of the assertion.
Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.
The assertion is true, but the reason is false.
Both the assertion and reason are false.
In this case, the assertion claims that sharks are categorized as ammonotelic animals. However, this assertion is false. Sharks are actually ureotelic animals, meaning they excrete urea as their primary nitrogenous waste product, not ammonia.
The reason given is that sharks have the ability to retain significant amounts of ammonia in their blood. This reason is also false. Sharks do not retain ammonia in their blood; instead, they convert ammonia into urea through their liver, which is then excreted.
Therefore, both the assertion and the reason are false, making option 4 the correct answer.