Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion Urea is a less toxic excretory substance comparatively to uric acid. Reason Birds and insects are uricotelic animals.A) extinction of these species from other regions
B) continental separation
C) absence of terrestrial route to these places
D) retrogressive evolution
Correct Answer: D
Solution :
Urea is more toxic than uric acid and less toxic to ammonia. Ammonia > Urea > Uric acid Urea formation takes place in kidneys. Birds and insects are uricotelic animals.
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