Q1. What is the structural and functional unit of the kidney?
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Answer: D. Nephron
Nephrons are the basic filtering units of the kidney that form urine.
Biology - Excretory System Questions for SSC CGL (with Answers)
4 Biology - Excretory System MCQs from the General Awareness section, with answers and short explanations.
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Q2. The main nitrogenous waste present in human urine is:
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Answer: B. Urea
Humans excrete nitrogen mainly as urea, which is made in the liver and removed by the kidneys.
Q3. The procedure of filtering blood using an artificial kidney is called:
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Answer: C. Haemodialysis
Haemodialysis uses a machine to remove nitrogenous wastes from the blood when kidneys fail.
Q4. Which tube carries urine from each kidney to the urinary bladder?
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Answer: C. Ureter
Each ureter carries urine from a kidney to the urinary bladder; the urethra carries it out of the body.
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