Excretory System Quiz - ICSE Class 10 Biology

Free practice quiz: Excretory System (ICSE Class 10 Biology). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 10 Biology practice quiz has 48 multiple-choice questions on Excretory System, and 48 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is NOT a primary function of the human excretory system?

   1. Removal of metabolic waste products
   2. Regulation of blood pH and osmolarity
   3. Synthesis of vitamin D
   4. Excretion of excess salts and water
   Show answer

   Answer: C. Synthesis of vitamin D

   While the skin, which is part of the integumentary system, plays a role in vitamin D synthesis upon exposure to UV radiation, it is not a primary function of the excretory system. The excretory system's main roles are waste removal, osmoregulation, and ion balance.

2. The secretion of excess hydrogen ions and potassium ions into the filtrate occurs mainly in the:

   1. Glomerulus
   2. Bowman's capsule
   3. Proximal convoluted tubule and distal convoluted tubule
   4. Loop of Henle
   Show answer

   Answer: C. Proximal convoluted tubule and distal convoluted tubule

   Tubular secretion is an important process for eliminating certain substances from the blood into the filtrate. Both the proximal and distal convoluted tubules are involved in secreting ions like H+ and K+, as well as some drugs and waste products.

3. Which of the following is a key function of the loop of Henle in urine concentration?

   1. Active secretion of urea
   2. Passive diffusion of water from the descending limb
   3. Countercurrent exchange mechanism
   4. Reabsorption of amino acids
   Show answer

   Answer: C. Countercurrent exchange mechanism

   The Loop of Henle, with its descending and ascending limbs, establishes a concentration gradient in the renal medulla through the countercurrent multiplier mechanism, which is vital for concentrating urine.

4. The countercurrent exchanger mechanism of the vasa recta helps to:

   1. Increase the osmolarity of the medulla
   2. Prevent the loss of the medullary osmotic gradient
   3. Reabsorb all filtered water
   4. Secrete excess glucose
   Show answer

   Answer: B. Prevent the loss of the medullary osmotic gradient

   The vasa recta, by exchanging solutes and water with the surrounding interstitial fluid in a countercurrent manner, prevent the dilution of the highly concentrated medullary interstitial fluid established by the loop of Henle, thus preserving the osmotic gradient necessary for concentrated urine formation.

5. Which of the following is NOT a function of the distal convoluted tubule?

   1. Secretion of potassium
   2. Selective reabsorption of sodium
   3. Reabsorption of glucose
   4. Fine-tuning of acid-base balance
   Show answer

   Answer: C. Reabsorption of glucose

   Glucose reabsorption primarily occurs in the proximal convoluted tubule. The distal convoluted tubule is involved in the selective reabsorption of ions (like sodium), secretion of ions (like potassium and hydrogen), and fine-tuning of water balance and acid-base balance.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The functional unit of the kidney responsible for filtering blood and forming urine is called:
2. Glomerular filtration rate (GFR) is a measure of kidney function. Which of the following processes is primarily responsible for the initial filtration of blood in the glomerulus?
3. Reabsorption of essential substances like glucose and amino acids primarily occurs in which part of the nephron?
4. The concentration of urine is regulated by the hormone:
5. Which component of blood is normally NOT found in the glomerular filtrate?
6. The feeling of thirst, which signals the need for water, is primarily regulated by the:
7. Damage to which part of the nephron would most severely impair the kidney's ability to reabsorb glucose?
8. The countercurrent multiplier mechanism in the Loop of Henle is crucial for:
9. Which of the following conditions would lead to a decrease in the reabsorption of sodium ions in the distal convoluted tubule and collecting duct?
10. The ureters are tubes that transport urine from the kidneys to the:
11. The primary role of the urinary bladder is:
12. Which of the following is an example of an excretory product that is NOT eliminated by the kidneys in mammals?
13. Dialysis is a medical procedure used to:
14. What is the role of the renal corpuscle (glomerulus and Bowman's capsule) in urine formation?
15. The vasa recta are specialized capillaries that surround the:
16. In a person with uncontrolled diabetes mellitus, what would be observed in their urine due to the inability of the proximal convoluted tubule to reabsorb all the filtered glucose?
17. The adrenal glands, located on top of the kidneys, produce hormones that influence kidney function, particularly aldosterone, which affects:
18. The filtration barrier in the glomerulus consists of all of the following EXCEPT:
19. Which of the following statements about the reabsorption of water in the nephron is FALSE?
20. The juxtaglomerular apparatus plays a key role in regulating:
21. The acidic nature of urine is primarily due to the presence of:
22. Which organ is primarily responsible for the breakdown of urea into ammonia in the urinary tract?
23. The absence of a functioning Bowman's capsule would prevent which process in urine formation?
24. The kidneys produce erythropoietin, a hormone that stimulates the production of:
25. Which of the following substances is actively secreted by the renal tubules to help regulate pH?
26. Which part of the nephron is primarily responsible for the secretion of penicillin and other drugs from the blood into the filtrate?
27. What is the effect of increased ADH (Antidiuretic Hormone) on the collecting ducts?
28. Which condition is characterized by the presence of large amounts of protein in the urine?
29. The renal artery carries blood:
30. Which of the following is a result of the secretion of hydrogen ions by the renal tubules?
31. The process by which substances are transported from the peritubular capillaries into the renal tubules is called:
32. A significant decrease in glomerular hydrostatic pressure would most directly affect:
33. The presence of urea in the renal medulla plays a role in:
34. The renal capsule is a tough, fibrous outer layer of the kidney that:
35. The ability of the kidneys to concentrate urine is directly proportional to the osmolarity gradient established in the:
36. The process of micturition, or urination, involves the relaxation of which muscles?
37. Which of the following correctly describes the role of the renal pelvis?
38. What is the primary site for tubular secretion of organic acids and bases, including drugs and metabolic waste products?
39. The descending limb of the loop of Henle is primarily permeable to:
40. Which hormone is responsible for increasing the reabsorption of calcium ions from the distal convoluted tubule and collecting duct?
41. The filtration of small solutes like urea and glucose from the blood into Bowman's capsule is driven by:
42. The reabsorption of bicarbonate ions (HCO3-) in the renal tubules is crucial for:
43. Which structure is responsible for the voluntary control of urination?

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