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.
Last updated
Read the Homeostasis notesFree MDCAT chapter notes with key terms698 questions · page 17 of 35
- A. Protozoa
- B. Porifera
- C. Echinoderm
- D. Fish
Explanation: Contractile vacuoles help protozoa maintain water balance in freshwater environments.
Correct answer: Protozoa- A. Hydrophytes
- B. Neophytes
- C. Mesophytes
- D. Xerophytes
Explanation: Xerophytes are plant species that have evolved over time to survive in dry regions.
Correct answer: Xerophytes- A. Regulation
- B. Homeostasis
- C. Balancing
- D. Thermoregulation
Explanation: Homeostasis definition in biology is the ability or tendency of the body or a cell to seek and maintain a condition of equilibrium - a…
Correct answer: Homeostasis- A. Pelvis and ureter
- B. Ureter and urinary bladder
- C. Urinary bladder and urethra
- D. Urethra and ureter
Explanation: The internal urethral sphincter is a urethral sphincter muscle which constricts the internal urethral orifice.
Correct answer: Urinary bladder and urethra- A. Large surface area of leaves
- B. Increase number of stomata
- C. Thick waxy cuticle
- D. Excessive loss of water
- E. Stomata on both sides of leaves
Explanation: Xerophytes are plants that have adaptations to survive in dry habitats with very little water.
Correct answer: Thick waxy cuticle326. Which of the following part of urinary system temporarily stores urine, and releases it when filled?
- A. Renal veins
- B. Kidney
- C. Renal Pelvis
- D. Urinary Bladder
- E. V
Explanation: Urinary bladder is the part of the urinary system that temporarily stores urine and releases it when filled.
Correct answer: Urinary Bladder- A. Ectothermic
- B. Endothermic
- C. Heterothermic
- D. Hypothermic
- E. Hyperthermic
Explanation: Humans are endothermic, which means they can generate and regulate their own body heat to maintain a constant body temperature despite…
Correct answer: Endothermic- A. Sweat
- B. Saliva
- C. Urine
- D. Stool
Explanation: Urine is the primary way that urea is excreted from the body. It contains a high concentration of urea, as well as other waste products.
Correct answer: Urine- A. Hypoxanthine
- B. Xanthophyll
- C. Adenine
- D. Allantoin
- E. Citrulline
Explanation: Xanthophyll is a type of carotenoid pigment. Carotenoids are pigments that give fruits and vegetables their yellow, orange, and red…
Correct answer: Xanthophyll- A. Heart
- B. Liver
- C. Pancreas
- D. Lungs
Explanation: The heart is located in the center of the chest, behind the breastbone. It is not directly involved in the position of the kidneys.
Correct answer: Liver- A. Pelvis
- B. Hilus
- C. Ureteral orifices
- D. Urethral orifices
Explanation: The ureters open into the urinary bladder through ureteral orifices. The ureteral orifices are slit-like openings that are located on the…
Correct answer: Ureteral orifices- A. Creatinine
- B. Ammonia
- C. Urea
- D. Uric Acid
Explanation: Ammonia, urea, and uric acid are the major forms of nitrogenous wastes excreted by animals.
Correct answer: Uric Acid- A. Homeostasis
- B. Natural health
- C. Structural adaptation
- D. Osmoregulation
Explanation: Homeostasis refers broadly to the mechanisms that organisms use to maintain a stable internal environment, which is vital for optimal cell…
Correct answer: Osmoregulation- A. Hydrophytes
- B. Mesophytes
- C. Xerophytes
- D. Succulent
Explanation: Brassica and rosa plants belong to mesophytes group. Mesophytes have moderate water availability.
Correct answer: Mesophytes- A. Anhydrobiosis
- B. Osmoregulators
- C. Thermoregulators
- D. Osmoconformers
Explanation: Osmoconformers are marine organisms that keep their internal fluids isotonic to their environment, that is, they maintain an internal…
Correct answer: Osmoconformers- A. Photosynthesis
- B. Ingestion
- C. Assimilation
- D. Deamination
Explanation: During deamination, enzymes remove the amino group as ammonia (NH3), producing nitrogenous wastes like Urea.
Correct answer: Deamination- A. Uric Acid
- B. Urea
- C. Ammonia
- D. Creatine
Explanation: The correct answer is Ammonia. Ammonia is highly soluble in water, which is why aquatic animals can afford to excrete it in large…
Correct answer: Ammonia- A. Positive feedback
- B. Negative feedback
- C. Internal feedback
- D. External feedback
Explanation: The correct answer is Negative feedback. This mechanism is crucial for maintaining homeostasis in the body.
Correct answer: Negative feedback- A. Hydrophytes
- B. Mesophytes
- C. Halophytes
- D. Xerophytes
Explanation: Most xerophytic plants have a thick waxy cuticle on their stems and leaves if they have them.
Correct answer: Xerophytes- A. Collecting tubule
- B. Proximal tubule
- C. Distal tubule
- D. Loop of Henle
Explanation: Part A is the Bowman's capsulePart B is the Descending limb of the loop of henle.Part C is the Distal tubule so, option C is the correct…
Correct answer: Distal tubule