Which of the following organs is primarily responsible for excreting waste products from the body
a) Liver
b) Lungs
c) Kidneys
d) Pancreas
Answer: c) Kidneys
What is the main waste product excreted by the kidneys in humans
a) Uric acid
b) Carbon dioxide
c) Urea
d) Bilirubin
Answer: c) Urea
Excretion is a vital process that helps to maintain which of the following in the body
a) Oxygen levels
b) Hormone production
c) Electrolyte balance
d) Bone density
Answer: c) Electrolyte balance
Which system in the body is responsible for excreting excess water, salts, and metabolic waste through sweat
a) Muscular system
b) Integumentary system
c) Digestive system
d) Nervous system
Answer: b) Integumentary system
Ammonia is a common waste product in many animals. How is it primarily excreted in aquatic animals like fish
a) Through feces
b) Through urine
c) Through gills
d) Through skin
Answer: c) Through gills
Which of the following is NOT an excretory organ in the human body
a) Skin
b) Lungs
c) Spleen
d) Liver
Answer: c) Spleen
The process of removing metabolic waste and excess substances from the bloodstream by the kidneys is known as:
a) Filtration
b) Secretion
c) Reabsorption
d) Excretion
Answer: d) Excretion
In humans, which of the following substances is NOT excreted through the urinary system
a) Sodium
b) Potassium
c) Glucose
d) Creatinine
Answer: c) Glucose
Which excretory organ in the human body also plays a significant role in detoxifying various substances, such as drugs and alcohol
a) Liver
b) Lungs
c) Kidneys
d) Bladder
Answer: a) Liver
The functional unit of the kidney responsible for filtration, reabsorption, and secretion is called:
a) Nephron
b) Ureter
c) Renin
d) Glomerulus
Answer: a) Nephron
Which of the following is a nitrogenous waste product commonly excreted by birds and reptiles
a) Ammonia
b) Urea
c) Uric acid
d) Carbon dioxide
Answer: c) Uric acid
In which part of the human excretory system is urine temporarily stored before being eliminated from the body
a) Ureter
b) Kidney
c) Urethra
d) Bladder
Answer: d) Bladder
Which of the following is NOT a function of the excretory system
a) Regulation of blood pressure
b) Removal of metabolic wastes
c) Maintenance of water and electrolyte balance
d) Production of hormones
Answer: d) Production of hormones
What is the primary excretory organ in insects
a) Malpighian tubules
b) Lungs
c) Kidneys
d) Liver
Answer: a) Malpighian tubules
Which of the following is a water-conserving adaptation in some desert-dwelling animals to reduce water loss during excretion
a) Increased urination frequency
b) Production of dilute urine
c) Reabsorption of water in the bladder
d) Production of concentrated urine
Answer: d) Production of concentrated urine
Which of the following is a disorder characterized by the build-up of uric acid crystals in the joints due to inefficient excretion of uric acid
a) Gout
b) Asthma
c) Anemia
d) Osteoporosis
Answer: a) Gout
The process of excreting metabolic waste products and excess substances from the blood into the kidney tubules is known as:
a) Filtration
b) Secretion
c) Reabsorption
d) Dialysis
Answer: b) Secretion
Which of the following animals uses the gills and the rectal gland as the primary excretory organs
a) Frogs
b) Birds
c) Sharks
d) Snakes
Answer: c) Sharks
In addition to the kidneys, which other organ plays a role in excretion by filtering and removing old or damaged red blood cells from the bloodstream
a) Liver
b) Spleen
c) Pancreas
d) Gallbladder
Answer: b) Spleen
Which hormone is produced by the kidneys to stimulate the production of red blood cells and, ultimately, affect the oxygen-carrying capacity of the blood
a) Insulin
b) Estrogen
c) Renin
d) Erythropoietin
Answer: d) Erythropoietin
The process of excreting waste products from the body through the digestive system is called:
a) Respiration
b) Defecation
c) Sweating
d) Micturition
Answer: b) Defecation
Which of the following substances is NOT excreted by the respiratory system during exhalation in humans
a) Carbon dioxide
b) Oxygen
c) Water vapor
d) Nitrogen
Answer: b) Oxygen
The excretion of metabolic wastes and excess substances through the skin in the form of sweat is essential for regulating:
a) Blood sugar levels
b) Body temperature
c) Hormone production
d) Bone density
Answer: b) Body temperature
In plants, the process of excretion primarily involves the elimination of waste products through:
a) Stomata
b) Roots
c) Flowers
d) Leaves
Answer: a) Stomata
Which of the following statements about the excretory system in humans is correct
a) The kidneys are located in the abdominal cavity, just below the liver.
b) Ureters connect the bladder to the urethra.
c) The urethra carries urine from the kidneys to the bladder.
d) The bladder is responsible for filtering waste products from the blood.
Answer: b) Ureters connect the bladder to the urethra.
The removal of excess salts and nitrogenous wastes by marine animals living in saltwater occurs primarily through:
a) Gills
b) Lungs
c) Kidneys
d) Skin
Answer: a) Gills
The process of filtration in the kidneys occurs primarily in which structure
a) Renal medulla
b) Renal cortex
c) Glomerulus
d) Loop of Henle
Answer: c) Glomerulus
Which of the following substances is commonly excreted through bile by the liver
a) Urea
b) Sodium
c) Bilirubin
d) Creatinine
Answer: c) Bilirubin
Which excretory organ is responsible for eliminating excess water and electrolytes through the formation of concentrated urine
a) Liver
b) Spleen
c) Kidneys
d) Pancreas
Answer: c) Kidneys
The excretion of uric acid instead of ammonia allows certain animals, like reptiles and birds, to conserve water and avoid the loss of precious fluids. What is this excretory adaptation called
a) Urea cycle
b) Uric acid cycle
c) Ammonia conversion
d) Uricotelism
Answer: d) Uricotelism