VAN-0001
QUESTION
Urinary bladder is absent in?
(A) Ox
(B) Dog
(C) Fowl
(D) Horse
ANSWER
(C) Fowl
EXPLAINATION
In fowl (birds), the urinary bladder is absent. The kidneys drain urine directly into the cloaca through the ureters, and there is no urinary bladder for storage.
Birds excrete nitrogen mainly as uric acid, which is eliminated as a semisolid paste along with fecal material through the cloaca. The absence of a urinary bladder also helps reduce body weight, which is advantageous for flight.