Excretory Products and Their Elimination
ICSE · Class 11 · Biology
Practice quiz for Excretory Products and Their Elimination — ICSE Class 11 Biology. MCQs and questions with answers to test your preparation.
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Which type of nitrogenous waste is excreted by most bony fish?
Which hormone increases water reabsorption in the collecting duct?
Where does ultrafiltration occur in the nephron?
Uric acid is excreted by which group of animals?
Sample Questions
Which part of the nephron has a brush border (microvilli)?
Show answer
c
The PCT (proximal convoluted tubule) is lined with microvilli (brush border), greatly increasing surface area for maximum reabsorption. Therefore, the correct answer is option (3) PCT.
Glucose is normally absent in urine because it is:
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b
Glucose is completely reabsorbed in the proximal convoluted tubule (PCT) by active transport. Glycosuria indicates blood glucose exceeds renal threshold. Therefore, the correct answer is option (2) Completely reabsorbed in the PCT.
Which organ produces urea in the human body?
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c
Urea is produced in the liver via the ornithine cycle (urea cycle) from ammonia generated by deamination of amino acids. Therefore, the correct answer is option (3) Liver.
The renal threshold for glucose is approximately:
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c
When blood glucose exceeds ~180 mg/dL, the PCT cannot reabsorb it all, and glucose appears in urine (glycosuria). Therefore, the correct answer is option (3) 180 mg/dL.
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