Daily Urea Excretion in Humans — NEET Biology
📚 Practice ConceptA healthy adult human excretes (on an average) ______ gm of urea/day.
Which of the following statements regarding the normal characteristics and composition of human urine are NOT correct? S1: Normal human urine is slightly alkaline, with an average pH of 7.4. S2: Under normal conditions, healthy urine contains only urea, uric acid, and water. S3: The presence of sodium ions in urine is always a pathological sign, indicating severe renal dysfunction. S4: A healthy adult typically excretes about 1 to 1.5 litres of urine per day. S5: Kidneys play a significant role in the removal of ammonia in ammonotelic animals.
View solution & NCERT explanation
Correct answer: B — S1, S2, S3 and S5 are not correct.
The question tests knowledge about the normal characteristics and composition of human urine and related excretory processes. S1: Normal human urine is slightly acidic, with an average pH of 6.0, not alkaline with a pH of 7.4. This statement is NOT correct. S2: Normal urine contains water, urea, uric acid, and various ions like Na+, K+, Cl-, phosphate, sulphate, and other substances. It does not contain *only* urea, uric acid, and water. This statement is NOT correct. S3: Sodium ions (Na+) are normally present in urine, as their concentration is conditionally regulated in the nephron. Their presence is not always a pathological sign. This statement is NOT correct. S4: A healthy adult human excretes, on average, 1 to 1.5 litres of urine per day. This statement is correct. S5: For ammonotelic animals, ammonia is generally excreted by diffusion across body surfaces or through gill surfaces, and kidneys do not play any significant role in its removal. This statement is NOT correct. Statements S1, S2, S3, and S5 are not correct. Therefore, option B is the correct answer.
What does NCERT say about healthy adult human excretes?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.