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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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Kidney and Urinary SystemThermoregulationExcretion
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698 questions · page 29 of 35

561. A cell is placed in a solution and it swells. This solution is _

  • A. Isotonic to cell
  • B. Hypertonic to cell
  • C. Hypotonic to cell
  • D. None of these

Explanation: When a cell is placed in a hypotonic solution, the concentration of solutes outside the cell is lower than inside the cell.

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Correct answer: Hypotonic to cell

562. A cell whose internal salt concentration is 0.3 /liter is placed in a solution having salt concentration 0.5/liter. The solution is _

  • A. Isotonic to the cell
  • B. Hypotonic to the cell
  • C. Hypertonic to the cell
  • D. None of these

Explanation: The correct answer is that the solution is hypertonic to the cell. A hypertonic solution has a higher concentration of solutes compared to…

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Correct answer: Hypertonic to the cell

563. Plasmolysis of a human red blood cell would occur if they were _

  • A. In an isotonic solution
  • B. In a hypertonic solution
  • C. In a hypotonic solution
  • D. None of the above

Explanation: Plasmolysis occurs when a cell is in a hypertonic solution, where the external solute concentration is higher than inside the cell.

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Correct answer: In a hypertonic solution

564. When an animal cell is placed in hypotonic environment, it will _

  • A. Undergo cytolysis
  • B. Undergo plasmolysis
  • C. Be at equilibrium
  • D. Its turgor pressure decreases

Explanation: An animal cell placed in a hypotonic environment will undergo cytolysis because water enters the cell due to the lower solute…

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Correct answer: Undergo cytolysis

565. _ are animals that do not adjust their internal osmolarity and are isotonic with their environment.

  • A. Osmoconformers
  • B. Osmoregulators
  • C. Thermoregulators
  • D. Thermoconformers

Explanation: The correct answer is Osmoconformers. These animals maintain an internal osmotic environment that is isotonic to their surroundings…

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Correct answer: Osmoconformers

566. The hormone regulates the transfer of sodium from the nephron to the blood.

  • A. Parathormone
  • B. Anti-diuretic hormone (ADH)
  • C. Aldosterone
  • D. Vasopressin

Explanation: Aldosterone is the correct answer because it is a hormone produced by the adrenal cortex that regulates sodium and potassium levels by…

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Correct answer: Aldosterone

567. Which one of the following has least toxicity?

  • A. Ammonia
  • B. Urea
  • C. Uric acid
  • D. All are highly toxic

Explanation: The correct answer is Uric acid. Uric acid is the least toxic nitrogenous waste product because it is almost insoluble in water and can be…

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Correct answer: Uric acid

568. The pH of human urine is

  • A. 7.4
  • B. 3.5
  • C. 5.00
  • D. 8.0

Explanation: The correct answer is 5.00. Human urine typically has a pH range of 4.5 to 8.0, with an average around 6.0.

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Correct answer: 5.00

569. Blood enters the kidney through a branch of the aorta called

  • A. Afferent arteriole
  • B. Efferent arteriole
  • C. Renal vein
  • D. Renal artery

Explanation: Blood enters the kidney through the renal artery, which is a direct branch from the aorta.

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Correct answer: Renal artery

570. It is technique of breaking kidney stones inside kidneys, ureters, and urinary bladder

  • A. Lithotrophy
  • B. Lithography
  • C. Lithotripsy
  • D. All options are correct

Explanation: The correct answer is Lithotripsy. Lithotripsy is a medical procedure that uses shock waves to break kidney stones into smaller pieces so…

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Correct answer: Lithotripsy

571. Regulation of body temperature in homeotherms during high environmental temperature involve

  • A. Vaso-dilation
  • B. Lowering the hairs
  • C. Reduction in sub-cutaneous fat
  • D. All A, B and C

Explanation: Homeotherms, or warm-blooded animals, maintain a constant body temperature regardless of environmental changes.

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Correct answer: All A, B and C

572. Regulation of body temperature in homeotherms during cold environmental temperature involve

  • A. Vaso-constriction
  • B. Erection of hairs
  • C. Increase in sub-cutaneous fat
  • D. All A, B, and C

Explanation: The correct answer is Option D: All A, B, and C. In homeotherms, the regulation of body temperature during cold environmental conditions…

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Correct answer: All A, B, and C

573. A cell with fully elastic wall is placed in hypertonic solution. What will occur?

  • A. Change in cell size and shape
  • B. The whole cell will shrink
  • C. Cytoplasm shrinks from the cell wall and undergoes plasmolysis
  • D. Increase in cell size

Explanation: In a hypertonic solution, the concentration of solutes outside the cell is greater than that inside.

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Correct answer: Cytoplasm shrinks from the cell wall and undergoes plasmolysis

574. Reduction in transpiration, thick leaves and cuticle is characteristic of:

  • A. Mesophytes
  • B. Epiphytes
  • C. Hydrophytes
  • D. Xerophytes

Explanation: Xerophytes have the adaptations for reduced rate of transpiration. Many xerophytes possess small, thick leaves to limit water loss by…

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Correct answer: Xerophytes

575. In each nephron, the inner end forms a cup-shaped swelling around a ball of capillaries called:

  • A. Bowman's Capsule
  • B. Glomerulus
  • C. Loop of Henle
  • D. Renal Pelvis

Explanation: The ball of capillaries is called the glomerulus, which is surrounded by a cup-shaped structure called Bowman's capsule.

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Correct answer: Bowman's Capsule

576. Blood is specially filtered in the glomerulus because glomerular walls are porous, and the fraction that reaches here provides the filtration pressure:

  • A. Osmotic Pressure
  • B. Blood Pressure
  • C. Interstitial Pressure
  • D. Diffusion Pressure

Explanation: The net filtration pressure (NFP) at the glomerulus is the difference between the net hydrostatic pressure and the blood colloid osmotic…

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Correct answer: Blood Pressure

577. Ali and his friends --- also invited to the party.

  • A. is
  • B. had
  • C. was
  • D. were

Explanation: The correct answer is 'were' because it is the past tense plural form of the verb 'be,' which agrees with the plural subject 'Ali and his…

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Correct answer: were

578. Spot the error. Had two cars. After selling the silver can, I am left with the red which is my family's favorite.

  • A. Two cars
  • B. Can
  • C. Red
  • D. Favorite

Explanation: The error in the sentence is in option (B) "can." It should be corrected by adding a noun or verb to complete the sentence properly.

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Correct answer: Can

579. In each question in the following, four alternative sentences are given. Choose the CORRECT one and fill the circle corresponding to that letter in the answer sheet.

  • A. "You're right to be concerned," said one veterinarian. "I would like to take a look at your dog."
  • B. "Your right to be concerned," said one veterinarian,"I would like to take a look at your dog."
  • C. "Your right to be concerned." said one veterinarian."I would like to take a look at your dog."
  • D. "Your right to be concerned," said one veterinarian.I would like to take a look of your dog.

Explanation: The correct answer is: "You're right to be concerned," said one veterinarian.

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Correct answer: "You're right to be concerned," said one veterinarian. "I would like to take a look at your dog."

580. In this section of logical deduction, the question consists of a brief passage (usually a report containing certain data regarding some social or economic problem), followed by certain inferences based on it. The student is required to analyze the contents (or data) of the passage and grasp the desirable facts from it. Then, student has to consider each of the given inferences in the context of the given passage. decide upon its degree of truth or falsity and then choose the hest alternative provided accordingly.The water resources of our country are very much underutilized. The main reason of this underutilization is the lack of capital and technology. A large portion of our water resources is wasted due to floods and unwise use of water for irrigation as well as domestic purposes. We can make full use of our water resources by building dams on rivers and by adopting policy of awareness among people not to waste water.The country does not have enough funds to utilize such water resources.

  • A. Definitely true
  • B. Probably true
  • C. Data inadequate
  • D. Probably false
  • E. Definitely false

Explanation: The correct answer is 'Definitely true'. The passage clearly states that the primary cause for underutilization of water resources is the…

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Correct answer: Definitely true
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