Skip to content
LoginStart free

Class XI · Biology

Excretory Products and their Elimination: NEET MCQ practice

319 practice questions on Excretory Products and their Elimination, including 21 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

319

Practice questions

209

Easy

110

Medium

0

Hard

Get it on Google PlayPractise on the web →

What Excretory Products and their Elimination covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Modes of excretion- ammonotelism, ureotelism, uricotelism
  • Human excretory system- structure and function; urine formation, osmoregulation
  • Regulation of kidney function- renin-angiotensin, atrial natriuretic factor, ADH, diabetes insipidus
  • Disorders- uraemia, renal failure, renal calculi, nephritis; dialysis and artificial kidney

Past NEET questions on Excretory Products and their Elimination

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

In frog, the Renal portal system is a special venous connection that acts to link :

  1. A.Liver and intestine
  2. B.Liver and kidney
  3. C.Kidney and intestine
  4. D.Kidney and lower part of body
Show answer

Answer: D. Kidney and lower part of body

In frogs, the renal portal system carries venous blood from the lower part of the body (hind limbs) to the kidneys before it returns to the heart. This connects the kidneys with the lower body for renal portal circulation.

Question 2 · NEET 2024

Given below are two statements: Statements I: Concentrated urine is formed due to counter current mechanism in nephron. Statement II: Counter current mechanism helps to maintain osmotic gradient in the medullary interstitium. In the light of the above statements, choose the most appropriate answer from the options given below.

  1. A.Statement I is correct but Statement II is incorrect.
  2. B.Statement I is incorrect but Statement II is correct.
  3. C.Both Statement I and Statement II are correct.
  4. D.Both Statement I and Statement II are incorrect.
Show answer

Answer: C. Both Statement I and Statement II are correct.

Countercurrent multiplier (loop of Henle) and exchanger (vasa recta) create osmotic gradient in medulla, enabling water reabsorption and concentrated urine formation. Both statements are physiologically correct.

Question 3 · NEET 2022

Terrestrial adaptations necessitated the production of :

  1. A.Lesser toxic nitrogenous wastes like urea and uric acid
  2. B.Lesser toxic nitrogenous wastes like ammonia and urea
  3. C.Highly toxic nitrogenous wastes like ammonia and urea
  4. D.Highly toxic nitrogenous wastes like urea and uric acid Ans.
Show answer

Answer: A. Lesser toxic nitrogenous wastes like urea and uric acid

Ammonia is highly toxic and requires copious water for excretion. Terrestrial animals need to conserve water, so they evolved to produce less toxic nitrogenous wastes like urea or uric acid.

Question 4 · NEET 2022

Nitrogenous waste is excreted in the form of pellet or paste by :

  1. A.Ornithorhynchus
  2. B.Salamandra
  3. C.Hippocampus
  4. D.Pavo
Show answer

Answer: D. Pavo

Birds and reptiles excrete nitrogenous waste as uric acid in semi-solid paste. Ornithorhynchus (platypus) is a monotreme mammal excreting urea. Salamandra (amphibian) excretes urea/ammonia. Hippocampus (bony fish) excretes ammonia. Pavo (peacock) is a bird, so excretes uric acid as paste/pellet.

Question 5 · NEET 2020

Which of the following would help in prevention of diuresis?

  1. A.Reabsorption of Na + and water from renal tubules due to aldosterone
  2. B.Atrial natriuretic factor causes vasoconstriction
  3. C.Decrease in the secretion of renin by JG cells
  4. D.More water reabsorption due to undersecretion of ADH
Show answer

Answer: A. Reabsorption of Na + and water from renal tubules due to aldosterone

Diuresis means excessive urine production. To prevent it, the body should reabsorb more water. ADH (antidiuretic hormone) promotes water reabsorption in the collecting duct. Undersecretion of ADH would cause more water excretion (diuresis), not prevent it. Aldosterone increases Na+ and water reabsorption, reducing urine output—this prevents diuresis.

More Class XI Biology chapters

All Biology chapters →