Excretory System Questions

Objective questions

What is excretion?

A) The process of absorbing nutrients B) The process of removing waste products from the body C) The breakdown of food in the digestive system D) The production of energy in cells

Correct Answer: B) The process of removing waste products from the body

Why is excretion important?

A) It prevents harmful waste buildup. B) It increases energy production. C) It promotes digestion. D) It increases cell division.

Correct Answer: A) It prevents harmful waste buildup.

Which organ in the urinary system filters blood to form urine?

A) Liver B) Kidney C) Ureter D) Bladder

Correct Answer: B) Kidney

What is the function of the ureter?

A) To store urine B) To transport urine to the bladder C) To filter blood D) To remove waste from the body

Correct Answer: B) To transport urine to the bladder

What are the two main regions of the kidney?

A) Medulla and cortex B) Bladder and urethra C) Nephrons and glomerulus D) Liver and pancreas

Correct Answer: A) Medulla and cortex

Which blood vessel brings blood into the kidney?

A) Renal vein B) Aorta C) Renal artery D) Vena cava

Correct Answer: C) Renal artery

What is the functional unit of the kidney?

A) Nephron B) Bladder C) Cortex D) Ureter

Correct Answer: A) Nephron

What structure collects filtered blood in the nephron?

A) Proximal tubule B) Henle's loop C) Bowman's capsule D) Distal tubule

Correct Answer: C) Bowman's capsule

What is the role of Henle's loop in the nephron?

A) Filters glucose from blood B) Aids in water and salt reabsorption C) Produces urea D) Stores urine

Correct Answer: B) Aids in water and salt reabsorption

What hormone regulates water reabsorption in the kidney?

A) Insulin B) Glucagon C) Antidiuretic hormone (ADH) D) Thyroxine

Correct Answer: C) Antidiuretic hormone (ADH)

Which organ removes carbon dioxide from the body?

A) Liver B) Skin C) Lungs D) Kidneys

Correct Answer: C) Lungs

How does the skin contribute to excretion?

A) By exhaling carbon dioxide B) By eliminating urea and salts through sweat C) By filtering blood D) By storing waste products

Correct Answer: B) By eliminating urea and salts through sweat

What role does the liver play in excretion?

A) It stores urine. B) It removes toxins like drugs and alcohol. C) It filters oxygen from the blood. D) It reabsorbs water.

Correct Answer: B) It removes toxins like drugs and alcohol.

What excretory structure is used by earthworms?

A) Flame cells B) Nephridia C) Malpighian tubules D) Gills

Correct Answer: B) Nephridia

How do flatworms excrete waste?

A) Through stomata B) Using nephridia C) Through flame cells D) By storing waste in leaves

Correct Answer: C) Through flame cells

What excretory products are eliminated by plants?

A) Carbon dioxide and oxygen B) Urea and ammonia C) Alcohol and bile D) Glucose and glycogen

Correct Answer: A) Carbon dioxide and oxygen

What helps earthworms exchange materials in their nephridia?

A) Blood vessels B) Flame cells C) Cilia D) Chloroplasts

Correct Answer: A) Blood vessels

Which of the following is a toxic by-product of protein metabolism?

A) Glucose B) Ammonia C) Oxygen D) Carbon dioxide

Correct Answer: B) Ammonia

In which part of the nephron does selective reabsorption primarily occur?

A) Proximal tubule B) Henle’s loop C) Distal tubule D) Bowman's capsule

Correct Answer: A) Proximal tubule

What is the main function of the distal convoluted tubule?

A) To filter blood B) To reabsorb water and concentrate urine C) To produce hormones D) To remove oxygen from blood

Correct Answer: B) To reabsorb water and concentrate urine

Theory Questions

Explain the mechanisms of waste removal through the stomata and lenticels.

Sketch an annotated diagram of the Kidney in mammals.

Discuss the functions of the liver as an excretory organ

Mention the three processes involved in the formation of urine in mammals

Mention other excretory organ in human