AIIMS 2014 Zoology Excretory System MCQ Question
The excretory form of nitrogen in arachnida is
urea
ammonia
guanine
uric acid
Correct Answer
Detailed Explanation
The correct answer is C) guanine because arachnids, such as spiders and scorpions, primarily excrete nitrogenous waste in the form of uric acid, which is a more water-insoluble compound. This adaptation allows them to conserve water in their terrestrial habitats, preventing dehydration. While guanine is indeed an excretory product found in some arachnids, uric acid is the more commonly recognized nitrogenous waste for this group.
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