🩺 NEET🧬 Biology

Excretory Products and their Elimination

2 solved NEET Biology previous year questions on Excretory Products and their Elimination, each with the correct answer and a full explanation.

A person who is on a long hunger strike and is surviving only on water, will have:

aless amino acids in his urine.

bmore glucose in his blood.

cless urea in his urine.

dmore sodium in his urine.

✓ Correct answer: c) less urea in his urine.

ExplanationA person who is on a long hunger strike and is surviving only on water, will have less urea in his urine.

Choose the correct statement given below regarding juxta medullary nephron. [NEET 2024]

aJuxta medullary nephrons outnumber the cortical nephrons.

bJuxta medullary nephrons are located in the columns of Bertini.

cRenal corpuscle of juxta medullary nephron lies in the outer portion of the renal medulla.

dLoop of Henle of juxta medullary nephron runs deep into medulla.

✓ Correct answer: d) Loop of Henle of juxta medullary nephron runs deep into medulla.

ExplanationJuxta medullary nephrons are characterized by: Long Loop of Henle that extends deep into the renal medulla, which is crucial for the formation of concentrated urine through the counter-current mechanism.Renal corpuscle located at the junction of the cortex and medulla.Vasa recta surrounding the long loop, playing a key role in maintaining the osmolarity gradient.(A) is incorrect because Cortical nephrons outnumber juxta medullary nephrons.(B) is incorrect as juxta medullary nephrons are not located in the columns of Bertini (these are extensions of the cortex between renal pyramids).(C) is incorrect because the Renal corpuscle lies close to the medulla, not in the outer cortex.Therefore, the correct statement is (D).

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