Excretory Products and Their Elimination — Important Questions
ICSE · Class 11 · Biology
56 important questions from Excretory Products and Their Elimination for ICSE Class 11 Biology, with answers. Includes multiple choice questions.
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Important Questions from Excretory Products and Their Elimination
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:
Show answer
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?
Show answer
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:
Show answer
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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