Solved UPSC CDS/OTA Question
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Q · Excretory SystemMedium · 45s
Which of the following nitrogenous wastes is least toxic and most water-conserving?
TopicExcretory System
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Uric acid is excreted as crystals, requiring minimal water. Birds and reptiles excrete uric acid.
Final Answer: Option C - Uric acid