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Free Excretion MCQs with Answers

57 Excretion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.

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57 questions · page 3 of 3

41. End product of hemoglobin break down is:

  • A. Creatinine
  • B. Bilirubin
  • C. Hypoxanthin
  • D. Xanthin

Explanation: Bilirubin is the end product of haemoglobin breakdown. When haemoglobin from old red blood cells is broken down, bilirubin is formed as a…

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Correct answer: Bilirubin

42. How much water approximately is required to excrete 1 kg of ammonia nitrogen?

  • A. 500 ml
  • B. 300 litre.
  • C. 5 litre.
  • D. 500 litre.

Explanation: 1kg of ammonia to be excreted in the form of Ammonia requires 500 liters of waterUrea requires 50 liters of waterUric acid requires 1…

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Correct answer: 500 litre.

43. How many grams of nitrogen can be eliminated in form of uric acid by 50 ml of water?

  • A. 20
  • B. 30
  • C. 25
  • D. 50

Explanation: Since only 1 ml of water is required to eliminate 1 g of nitrogen in the form of uric acid, then 50 g of nitrogen will be eliminated by 50…

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Correct answer: 50

44. Which one of these is an example of tubular excretory system called metanephridia?

  • A. Planaria.
  • B. Cockroach.
  • C. Hydra.
  • D. Earthworm.

Explanation: Earthworms are Annelids possessing complex metanephridia.

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Correct answer: Earthworm.

45. Metabolic waste from metabolism of nucleic acid is:

  • A. Uric acid
  • B. Creatine
  • C. Urea
  • D. Creatinine

Explanation: Option [a] Uric acid is the chemical created when the body breaks down substances called purines, nucleic acid contains purines, adenine…

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Correct answer: Uric acid

46. Which one of the following is the main nitrogenous waste product in humans

  • A. Urea
  • B. Ammonia
  • C. Salts
  • D. Uric acid

Explanation: Urea is the main nitrogenous waste product in humans, that is produced in the liver after deamination of amino acids.

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Correct answer: Urea

47. The removal of metabolic waste from the blood is called

  • A. Thermoregulation
  • B. Osmoregulation
  • C. Kidney Failure
  • D. Excretion

Explanation: Excretion is the process why which metabolic waste is removed from our body its includes the removal of waste through kidney,skin or…

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Correct answer: Excretion

48. Highly toxic nitrogenous excretory products are:

  • A. CO2
  • B. Uric Acid
  • C. Urea
  • D. Ammonia

Explanation: The table above shows that ammonia requires the highest percentage of water for excretion, which shows that ammonia contains the highest…

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Correct answer: Ammonia

49. The major and immediate nitrogenous waste product of protein metabolism is:

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

Explanation: Urea is the major and immediate nitrogenous waste product of protein metabolism in humans and most mammals.

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Correct answer: Ammonia

50. Urea formation occurs in:

  • A. Kidney
  • B. Liver
  • C. Spleen
  • D. Lungs

Explanation: b) Liver:This option states that urea formation occurs in the liver. This statement is correct.

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Correct answer: Liver

51. Malphigian tubules convert nitrogenous waste into:

  • A. urine
  • B. ammonia
  • C. uric acid
  • D. urea

Explanation: Malphigian tubules are specialized excretory organs found in insects like cockroaches.

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Correct answer: uric acid

52. Surplus amino acids in the body are broken down to form urea in:

  • A. Spleen
  • B. Kidneys
  • C. Liver
  • D. Pancreas

Explanation: The liver is the primary organ where surplus amino acids are broken down.

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Correct answer: Liver

53. Excretion of bile pigments in blood indicates:

  • A. Anaemia
  • B. Diabetes
  • C. Rickets
  • D. Jaundice

Explanation: The correct answer is Jaundice. Jaundice is characterized by a yellowing of the skin, eyes, and mucous membranes due to elevated levels of…

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Correct answer: Jaundice

54. The birds excrete:

  • A. Ammonia
  • B. Urea
  • C. Uric acid
  • D. Acetic acid

Explanation: Birds excrete nitrogenous waste primarily in the form of uric acid. This adaptation is crucial for conserving water, as uric acid requires…

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Correct answer: Uric acid

55. The organs of excretion in crustacean are :

  • A. Coxal glands
  • B. Flame cells
  • C. Malpighian tubules
  • D. Nephridia

Explanation: Crustaceans are members of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species…

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Correct answer: Coxal glands

56. Some marine fishes possess salt-excreting organs known as:

  • A. Thyroid gland
  • B. Pituitary gland
  • C. Adrenal gland
  • D. Rectal gland

Explanation: The correct answer is the rectal gland, which is a specialized salt-secreting organ found in cartilaginous fishes like sharks.

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Correct answer: Rectal gland

57. Ovalates are abundantly present in _

  • A. Onion
  • B. Potatoes
  • C. Guava
  • D. Tomatoes

Explanation: Ovalates are abundantly present in tomatoes. They are a type of organic acid found in various fruits and vegetables, including tomatoes.

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Correct answer: Tomatoes
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