Chapter Exam

Chapter 8: Excretion — Online MCQ Test

Q: Which of the following is the primary nitrogenous waste product in humans?

Answer: B. Urea — Humans are ureotelic, meaning they excrete urea as the main nitrogenous waste.

Q: The functional unit of the human kidney is called ________.

Answer: B. Nephron — The nephron is the structural and functional unit of the kidney responsible for filtration and urine formation.

Q: Which of the following hormones increases water reabsorption in the collecting duct?

Answer: B. ADH (Vasopressin) — ADH increases the permeability of the collecting ducts to water, promoting water reabsorption.

Q: If the afferent arteriole diameter is decreased, what would be the immediate effect?

Answer: B. Decreased glomerular filtration rate — Reducing the diameter of the afferent arteriole decreases blood flow to the glomerulus, leading to a drop in GFR.

Q: In a condition of metabolic acidosis, what would be the kidney's response?

Answer: A. Reabsorption of bicarbonate and secretion of H+ — To normalize pH, the kidneys conserve bicarbonate (a base) and excrete excess hydrogen ions.

ZOOLOGY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 8: Excretion with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th ZOOLOGY. This chapter covers: Focusing on osmoregulation and excretion this chapter details human urinary system kidney structure and nephron function. Students examine urine formation mechanisms counter-curren.... AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Chapter 8: Excretion — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th ZOOLOGY — Chapter 8: Excretion, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the primary nitrogenous waste product in humans?

A. Ammonia
B. Urea ✓
C. Uric acid
D. Creatinine

Answer: B. Urea
Humans are ureotelic, meaning they excrete urea as the main nitrogenous waste.

The functional unit of the human kidney is called ________.

A. Neuron
B. Nephron ✓
C. Ureter
D. Pelvis

Answer: B. Nephron
The nephron is the structural and functional unit of the kidney responsible for filtration and urine formation.

Which of the following hormones increases water reabsorption in the collecting duct?

A. Aldosterone
B. ADH (Vasopressin) ✓
C. Renin
D. Atrial Natriuretic Factor

Answer: B. ADH (Vasopressin)
ADH increases the permeability of the collecting ducts to water, promoting water reabsorption.

If the afferent arteriole diameter is decreased, what would be the immediate effect?

A. Increased glomerular filtration rate
B. Decreased glomerular filtration rate ✓
C. No change in filtration
D. Increased blood flow to the glomerulus

Answer: B. Decreased glomerular filtration rate
Reducing the diameter of the afferent arteriole decreases blood flow to the glomerulus, leading to a drop in GFR.

In a condition of metabolic acidosis, what would be the kidney's response?

A. Reabsorption of bicarbonate and secretion of H+ ✓
B. Reabsorption of H+ and secretion of bicarbonate
C. Increased reabsorption of water only
D. Decreased filtration of glucose

Answer: A. Reabsorption of bicarbonate and secretion of H+
To normalize pH, the kidneys conserve bicarbonate (a base) and excrete excess hydrogen ions.

← Previous Chapter

Chapter 7: Body Fluids and Circulation

Next Chapter →

Chapter 9: Locomotion and Movement