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Excretory Products and Their Elimination MCQs for NEET — Zoology Questions with Answers

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NEET 2024

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Given below are two statements:

Statement I: In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.

Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.

In the light of the above statements, choose the correct answer from the options given below:

A. Statement I is false but Statement II is true B. Both Statement I and Statement II are true C. Both Statement I and Statement II are false D. Statement I is true but Statement II is false

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Explanation

Descending limb is permeable to water and impermeable to electrolytes (the opposite of what is claimed) — Statement I is false. PCT lining is correct.

NEET 2024

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Choose the correct statement given below regarding juxta medullary nephron.

A. Juxta medullary nephrons outnumber the cortical nephrons. B. Juxta medullary nephrons are located in the columns of Bertini. C. Renal corpuscle of juxta medullary nephron lies in the outer portion of the renal medulla. D. Loop of Henle of juxta medullary nephron runs deep into medulla.

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Explanation

Juxtamedullary nephrons have long loops of Henle that extend deep into the medulla — the basis of the counter-current mechanism.

NEET 2025

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Which of the following correctly describes the transport activity in the proximal (P) and distal (D) convoluted tubule of the nephron?

A. P: reabsorbs HCO₃⁻, NaCl and H₂O, secretes H⁺ and NH₃; D: reabsorbs NaCl and H₂O, secretes K⁺ and H⁺ B. P: secretes HCO₃⁻ and NaCl; D: reabsorbs K⁺ and H⁺ C. P: reabsorbs H⁺ and NH₃; D: secretes NaCl and H₂O D. P: secretes NaCl and HCO₃⁻; D: reabsorbs NH₃ and H₂O

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Explanation

The PCT reabsorbs most HCO₃⁻, NaCl and water and secretes H⁺ and NH₃ to maintain pH; the DCT reabsorbs NaCl and water and secretes K⁺ and H⁺ under hormonal control.

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