Excretory Products and Their Elimination Quiz (MCQs with Answers)
What You Will Learn
- Types of excretory products: ammonia, urea, uric acid
- Structure and function of the human excretory system
- Process of urine formation in nephrons
- Important MCQs for NEET and board exams
Why This Quiz is Important
- Covers important exam-based questions
- Helps revise key NCERT concepts quickly
- Improves accuracy and conceptual understanding
Excretion is a vital biological process through which organisms remove metabolic waste products. These wastes, if accumulated, can become toxic and disturb the internal balance of the body.
In humans, the excretory system plays an essential role in maintaining homeostasis by regulating water balance, removing nitrogenous wastes, and controlling ion concentration.
This quiz will help you test your understanding of excretory products and their elimination in a simple and effective way.
QUICK REVISION
1. Types of Excretory Products
- Ammonia – Highly toxic, requires large amount of water (aquatic animals)
- Urea – Less toxic, excreted by humans
- Uric Acid – Least toxic, excreted by birds and reptiles
2. Human Excretory System Includes
- Kidneys
- Ureters
- Urinary bladder
- Urethra
3. Nephron – Functional Unit of Kidney
- Filters blood
- Removes waste substances
- Forms urine
4. Steps of Urine Formation
- Glomerular filtration
- Tubular reabsorption
- Tubular secretion
Test Your Knowledge (MCQ Quiz)
Choose the correct answer for each question and test your understanding.
Q1. Which is the main nitrogenous waste in humans?
A. Ammonia
B. Urea
C. Uric acid
D. Creatinine
Q2. Which organ is primarily responsible for excretion in humans?
A. Liver
B. Lungs
C. Kidneys
D. Heart
Q3. What is the functional unit of the kidney?
A. Neuron
B. Nephron
C. Alveoli
D. Tubule
Q4. Which nitrogenous waste is least toxic?
A. Ammonia
B. Urea
C. Uric acid
D. Protein
Q5. Where does glomerular filtration occur?
A. Loop of Henle
B. Bowman’s capsule
C. Ureter
D. Collecting duct
Q6. Which process involves reabsorption of useful substances?
A. Filtration
B. Secretion
C. Reabsorption
D. Excretion
Q7. Which of the following is excreted by birds?
A. Ammonia
B. Urea
C. Uric acid
D. Glucose
Q8. Which structure carries urine from kidney to bladder?
A. Urethra
B. Ureter
C. Nephron
D. Vein
Q9. Which process removes waste from blood into nephron?
A. Reabsorption
B. Secretion
C. Filtration
D. Digestion
Q10. What is the main function of excretion?
A. Digestion
B. Respiration
C. Removal of metabolic wastes
D. Circulation
Answers with Explanation
Q1. Answer: Urea
Explanation: Urea is the main nitrogenous waste in humans and is produced in the liver.
Q2. Answer: Kidneys
Explanation: Kidneys filter blood and remove waste substances through urine.
Q3. Answer: Nephron
Explanation: Nephron is the structural and functional unit of the kidney.
Q4. Answer: Uric acid
Explanation: Uric acid is least toxic and requires minimum water for excretion.
Q5. Answer: Bowman’s capsule
Explanation: Glomerular filtration occurs in Bowman’s capsule of nephron.
Q6. Answer: Reabsorption
Explanation: Useful substances like glucose and water are reabsorbed.
Q7. Answer: Uric acid
Explanation: Birds excrete uric acid to conserve water.
Q8. Answer: Ureter
Explanation: Ureter transports urine from kidney to urinary bladder.
Q9. Answer: Filtration
Explanation: Filtration removes waste from blood into nephron.
Q10. Answer: Removal of metabolic wastes
Explanation: Excretion helps remove harmful waste products from the body.
Important Points to Remember
- Humans are ureotelic organisms
- Kidneys regulate water and ion balance
- Nephrons are the functional units of kidneys
- Excretion is essential for homeostasis
Related Topics
- Cell Membrane
- Cell wall
- cell cycle
- Body Fluids and Circulation (Coming Soon)
Frequently Asked Questions
What are excretory products?
Excretory products are waste substances formed during metabolism, such as urea, ammonia, and uric acid.
Which organ is responsible for excretion in humans?
Kidneys are the main organs responsible for excretion.
What is a nephron?
A nephron is the functional unit of the kidney that filters blood and forms urine.
Why is excretion important?
Excretion removes toxic wastes and maintains internal balance in the body.
