Free Homeostasis MCQs with Answers
698 Homeostasis MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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Read the Homeostasis notesFree MDCAT chapter notes with key terms698 questions · page 11 of 35
- A. Anisotonic
- B. Isotonic
- C. Hypotonic
- D. Hypertonic
Explanation: A solution with higher osmotic pressure compared to the surrounding cells or bodily fluids is a hypertonic solution.
Correct answer: Hypertonic202. Mango plant is:
- A. Mesophyte
- B. Hydrophyte
- C. Xerophyte
- D. None of the above
Explanation: A plant adapted to grow in environments with moderate water availability, neither extremely wet nor dry, are mesophytes.
Correct answer: Mesophyte- A. Metanephridium
- B. Protonephridium
- C. Nephron
- D. Nephridium
Explanation: A protonephridium is a simple excretory system found in flatworms, consisting of tubules with flame cells that remove metabolic waste from…
Correct answer: Protonephridium- A. Urea
- B. Arginine
- C. Arginosuccinate
- D. Citrulline
Explanation: Citrulline is an amino acid involved in the urea cycle, where it is converted into arginosuccinate.
Correct answer: Citrulline- A. Filters blood instead of coelomic fluid
- B. Function in both osmoregulation and excretion of nitrogenous wastes
- C. Form urine by changing the composition of fluid inside the tubule
- D. Is intimately associated with a capillary network
Explanation: Unlike an earthworm, metanephridia in mammalian nephron filters blood instead of coelomic fluid.
Correct answer: Filters blood instead of coelomic fluid- A. Filteration
- B. Transport across the epithelium of a collecting duct
- C. Reabsorption
- D. Secretion
Explanation: Explanation for this question will be added soon!
Correct answer: Filteration- A. Vertebrate
- B. Annelids
- C. Insects
- D. Flatworms
Explanation: Insects are a class of invertebrates within the arthropod phylum. They are characterized by a three-part body (head, thorax, and abdomen)…
Correct answer: Insects- A. Adult amphibians
- B. Organism that produce eggs
- C. Bony fishes
- D. Insect
Explanation: Bony fishes, also known as osteichthyes, constitute a diverse group of fish characterized by the presence of a bony skeleton.
Correct answer: Bony fishes- A. Detoxification of harmful chemicals
- B. Energy reserves in the formation of glycogen
- C. Production of Nitrogenous wastes
- D. Osmoregulation by variable excretion of salts
Explanation: The vertebrate liver functions in all the following regulatory processes, except osmoregulation by variable excretion of salts.
Correct answer: Osmoregulation by variable excretion of salts- A. A hormone triggers the heat production by increasing metabolic rate
- B. A behavioral adaptation for absorbing heat in ectotherms
- C. Muscle contraction by movements as in winter months
- D. A heat producing method of large fishes
Explanation: Non-shivering thermogenesis is a hormone triggers the heat production by increasing metabolic rate.
Correct answer: A hormone triggers the heat production by increasing metabolic rate- A. 1/10
- B. 1/20
- C. 1/5
- D. 1/50
Explanation: Urea can be eliminated with 1/10 quantity of water as compared to ammonia.
Correct answer: 1/10- A. Meat
- B. Tomatoes
- C. Green vegetable only
- D. Green vegetable and tomatoes
Explanation: Oxalates are present in green vegetables and tomatoes therefore may be the source of hyperoxaluria.
Correct answer: Green vegetable and tomatoes- A. Physiological adaptation
- B. Structural adaptation
- C. Behavioral adaptation
- D. Morphological & physiological adaptations
Explanation: Movement of ground squirrel to burrows in midday heat is a behavioral adaptation.
Correct answer: Behavioral adaptation- A. 36.1oC-37.8oC
- B. 36.0oC-38.8oC
- C. 36.7oC-37.8oC
- D. 37.1oC- 38.6oC
Explanation: Normal body temperature range between 36.1oC-37.8oC.
Correct answer: 36.1oC-37.8oC215. Vasodilation:
- A. Nucleic acid
- B. Increase the blood supply to the skin
- C. Protein
- D. ADH
Explanation: Vasodilation increase the blood supply to the skin.
Correct answer: Increase the blood supply to the skin216. Nitrogenous base:
- A. Ectotherm
- B. Protein
- C. Nucleic acid
- D. ADH
Explanation: Nucleic acids are macromolecules essential for genetic information storage and transfer in living organisms.
Correct answer: Nucleic acid217. Collecting duct:
- A. ADH
- B. Protein
- C. Ectotherm
- D. Increase the blood supply to the skin
Explanation: ADH, or Antidiuretic Hormone, regulates water balance in the body by influencing water reabsorption in the kidneys.
Correct answer: ADH218. Stone of uric acid:
- A. Adrenal cortex
- B. 15%
- C. Kidney machine
- D. 10%
Explanation: Stones of calcium phosphate and of uric acid are 15% and 10% respectively.
Correct answer: 10%- A. Presence of sweat gland
- B. Liver
- C. Kidney machine
- D. Adrenal cortex
Explanation: These may be long term changes in sub dermal fatty layer insulation and pelage. The presence of sweat glands and lungs modified for panting.
Correct answer: Presence of sweat gland220. Aldosterone:
- A. Presence of sweat gland
- B. Adrenal cortex
- C. Liver
- D. Kidney machine
Explanation: Explanation for this question will be added soon!
Correct answer: Adrenal cortex