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 20 of 35
- A. Mesophytes
- B. Sciophytes
- C. Xerophytes
- D. Hydrophytes
- E. Halophytes
Explanation: Hydrophytes are aquatic plants that thrive in water-saturated environments.
Correct answer: Hydrophytes- A. Guttation
- B. Transpiration
- C. Photosynthesis
- D. Osmosis
Explanation: Transpiration is the process of water evaporation from plant surfaces, especially leaves, which cools the plant.
Correct answer: Transpiration383. High level of _ and _ in the blood and the contributing factors in the formation of kidney stones.
- A. Calcium, oxalate
- B. Calcium, magnesium
- C. Calcium, sodium
- D. Sodium, sulphate
Explanation: Kidney stones are principally formed by calcium as the cation, and one of its most common forms are calcium oxalate stones which have…
Correct answer: Calcium, oxalate- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In hot temperatures, the body needs to cool down, which is done by increased blood flow to the skin, so that more heat is released from…
Correct answer: Option D- A. Pituitary gland
- B. Kidneys
- C. Hypothalamus
- D. Adrenal gland
Explanation: Much like a thermostat regulates the temperature inside your home, the hypothalamus regulates your body temperature, responding to…
Correct answer: Hypothalamus- A. Glomerular filtration
- B. Excretion
- C. Tubular secretion
- D. Tubular reabsorption
Explanation: The mechanism by which substances are removed from the blood and are directly added to the tubular fluids is called tubular secretion.
Correct answer: Tubular secretion- A. Uric Acid
- B. Urea
- C. Ammonia
- D. Creatinine
Explanation: Levels of solubility of nitrogenous waste, From higher to lowerAmmonia > urea > uric acidLevels of toxicityAmmonia > urea > uric acid
Correct answer: Ammonia- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Most of the water is reabsorbed from nephrons in the descending loop of Henle.
Correct answer: Option C- A. Kidney → ureter → urinary bladder → urethra
- B. Urinary bladder → kidney → ureter → urethra
- C. Kidney → urethra → urinary bladder → ureter
- D. Kidney → ureter → urethra → urinary bladder
Explanation: Option A describes the correct route of urine excretion. The kidney filters blood and forms urine.
Correct answer: Kidney → ureter → urinary bladder → urethra- A. Change in cell size and shape
- B. The whole cell will shrink
- C. Cytoplasm shrinks from the cell wall and undergoes plasmolysis
- D. Decrease in cell size
Explanation: When a cell with a fully elastic wall is placed in a hypertonic solution, the water inside the cell will move out of the cell by osmosis.
Correct answer: Cytoplasm shrinks from the cell wall and undergoes plasmolysis- A. Juxtamedullary nephrons
- B. Cortical nephrons
- C. Internal nephrons
- D. Outer nephrons
Explanation: Juxtamedullary nephrons are nephrons that are located at the border of the cortex and medulla of the kidney.
Correct answer: Juxtamedullary nephrons- A. Winter
- B. Summer
- C. Autumn
- D. Spring
Explanation: Poikilotherm is an organism with a variable body temperature that is usually slightly higher than the temperature of its environment : a…
Correct answer: Winter- A. 1%
- B. 3%
- C. 5%
- D. 7%
Explanation: Water is the most important renewable resource of environment.Water covers about 70% of the surface of earth.It is the major constituent…
Correct answer: 1%- A. Glucose
- B. Salt
- C. Toxins
- D. Water
Explanation: In a healthy person, liquid X does not contain glucose. In a diabetic person, glucose does occur in urine.
Correct answer: Glucose- A. Atrial natriuretic factor
- B. Aldosterone
- C. ADH
- D. Renin
Explanation: • Atrial natriuretic factor (ANF) is responsible for lowering of blood pressure and volume.
Correct answer: Atrial natriuretic factor- A. The descending limb of loop of Henle is impermeable to water.
- B. The ascending limb of loop of Henle is permeable to water.
- C. The descending limb of loop of Henle is permeable to electrolytes.
- D. The ascending limb of loop of Henle is impermeable to water.
Explanation: The key difference between ascending and descending loop of Henle is that the ascending loop of Henle is the thicker segment of the loop…
Correct answer: The ascending limb of loop of Henle is impermeable to water.- A. No change in quality and quantity of urine
- B. No urine formation
- C. More diluted urine
- D. More concentrated urine
Explanation: The proximal convoluted tubule is involved in the active and passive absorption of solutes like sodium, potassium, bicarbonate, glucose…
Correct answer: More diluted urine398. Which of the following causes an increase in sodium reabsorption in the distal convoluted tubule?
- A. Increase in aldosterone levels
- B. Increase in antidiuretic hormone levels
- C. Decrease in aldosterone levels
- D. Decrease in antidiuretic hormone levels
Explanation: Aldosterone is a hormone secreted by the outer layer of the adrenal gland (cortex part).Decreased blood volume and interstitial fluid…
Correct answer: Increase in aldosterone levels- A. Ascending limb of loop of Henle
- B. Distal convoluted tubule
- C. Proximal convoluted tubule
- D. Descending limb of loop of Henle
Explanation: During glomerular filtration in kidneys, ultrafiltration of blood occurs i.e: almost all the constituents of plasma except proteins pass…
Correct answer: Proximal convoluted tubule- A. Four chambered heart
- B. Internal fertilization
- C. Nucleated RBCs
- D. Ureotelic mode of excretion
Explanation: Excretion of urea is known as ureotelism and the animals which excrete urea are called ureotelic.
Correct answer: Ureotelic mode of excretion