Class 11 · Biology
Excretory Products and their Elimination
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BiologyPlate 21
NeetVellum atlas · fig. biology
21
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Three examples from the live 150-question bank. Answers appear after attempting them in practice mode.
Example 1 · difficulty 1/5
Aquatic amphibians and most bony fishes are ammonotelic. The chief reason ammonia can serve as their primary nitrogenous waste is that it:
- A. is insoluble in water and can be stored harmlessly in tissues
- B. requires very little water for its elimination from the body
- C. is highly soluble in water and diffuses readily across general body surfaces
- D. is converted into urea by the liver before being excreted
Example 2 · difficulty 2/5
The glomerular filtration rate in a healthy adult is about 125 mL min⁻¹. The total volume of filtrate formed by the two kidneys in 24 hours, and the approximate fraction of it reabsorbed by the renal tubules, are respectively:
- A. 180 L and about 99%
- B. 180 L and about 70-80%
- C. 125 L and about 99%
- D. 1.8 L and about 1%
Example 3 · difficulty 3/5
During the operation of the counter current mechanism in the human kidney, the descending limb of the loop of Henle:
- A. is impermeable to water but actively transports NaCl into the medullary interstitium
- B. is permeable to water but almost impermeable to electrolytes
- C. is permeable to water and actively reabsorbs NaCl along its entire length
- D. is impermeable to both water and electrolytes, so the filtrate flows through unchanged
The chapter mastery loop
- 1. Attempt firstExpose recall gaps before rereading.
- 2. Classify the missConcept, careless, rushed or guessed.
- 3. Re-practiceReturn until the error pattern disappears.
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How should I revise Excretory Products and their Elimination for NEET?
Attempt questions before rereading, classify each miss, revisit the exposed NCERT concept, then re-practice until the error pattern disappears.