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Excretory Products and Their Elimination question

2023 · Q46
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Excretory Products and Their Elimination question

2023 · Q46

NEETBiologyExcretory Products and Their EliminationMCQ+4 / −1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and medulla.

Reason R : Juxta medullary nephrons have short loop of Henle whereas, cortical nephrons have longer loop of Henle.

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

  1. A
    Both A and R are true but R is NOT the correct explanation of A.
  2. B
    A is true but R is false.
  3. C
    A is false but R is true.
  4. D
    Both A and R are true and R is the correct explanation of A.
View written solutionFree

Correct answer: B

The correct answer is :

Option B : A is true but R is false.

Explanation :

Assertion A is correct. In the kidney, nephrons, the functional units responsible for filtration, reabsorption, and secretion processes, are indeed of two types: cortical and juxta-medullary. These types are classified based on their location within the kidney; cortical nephrons are primarily located in the cortex, while juxta-medullary nephrons are located near the junction between the cortex and medulla.

However, Reason R is incorrect. The assertion that juxta-medullary nephrons have short loops of Henle, while cortical nephrons have longer loops of Henle is false. In fact, it's the opposite. Juxta-medullary nephrons have longer loops of Henle which extend deep into the medulla. This allows them to concentrate urine more effectively than cortical nephrons, whose loops of Henle are shorter and do not extend as deep into the medulla.

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