Chapter 8: Excretion — Online MCQ Test
ZOOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 8: Excretion with a free chapter-wise online MCQ test.
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.
Chapter 8: Excretion — Important Questions & Answers
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.
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.
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.
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.
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.
To normalize pH, the kidneys conserve bicarbonate (a base) and excrete excess hydrogen ions.