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 28 of 35
- A. Earthworm
- B. Planaria
- C. Hydra
- D. Cockroach
Explanation: The correct answer is Hydra. Hydra is a simple multicellular organism that lacks specialized organs for excretion.
Correct answer: Hydra- A. Planaria
- B. Hydra
- C. Cockroach
- D. None
Explanation: The correct answer is 'None'. Metanephridia are a type of excretory and osmoregulatory system found in certain invertebrates, particularly…
Correct answer: None- A. Isotonic
- B. Hypotonic
- C. Hypertonic
- D. None
Explanation: Freshwater fish have an internal environment that is hypertonic compared to the surrounding water.
Correct answer: Hypertonic- A. Urea
- B. Ammonia
- C. Uric Acid
- D. None
Explanation: The correct answer is Ammonia. Hydra, an aquatic organism, excretes ammonia as its waste product.
Correct answer: Ammonia- A. Normal temperature
- B. Hot temperature
- C. Cold temperature
- D. None
Explanation: During cold temperatures, the human body employs several mechanisms to conserve heat and maintain internal body temperature, a process…
Correct answer: Cold temperature- A. Peritubular capillaries
- B. Afferent arterioles
- C. Glomerulus
- D. Vasa recta
Explanation: The peritubular capillaries are the blood vessels that surround the proximal tubules.
Correct answer: Peritubular capillaries- A. Pelvis
- B. Cortex
- C. Medulla
- D. Hilum
Explanation: The correct answer is hilum. The hilum is the recessed central fissure where the kidney's blood vessels, nerves, and ureter pass through.
Correct answer: Hilum- A. Ammonia
- B. Uric acid
- C. Urea
- D. None of these
Explanation: The correct answer is uric acid, as it is the primary nitrogenous waste product excreted by reptiles, birds, and insects.
Correct answer: Uric acid- A. Oxygen
- B. Water molecules
- C. Uric acid
- D. Carbon dioxide
Explanation: The correct answer is carbon dioxide. Ammonia combines with carbon dioxide in the liver to form urea, which is then excreted from the…
Correct answer: Carbon dioxide- A. Dorsal abdominal wall
- B. Lateral abdominal wall
- C. Ventral abdominal wall
- D. All of these
Explanation: The correct answer is Option B: Lateral abdominal wall. The kidneys are retroperitoneal organs, meaning they are located behind the…
Correct answer: Lateral abdominal wall- A. Afferent arterioles
- B. Efferent arterioles
- C. Vasa recta
- D. Glomerulus
Explanation: The correct answer is vasa recta. The vasa recta are specialized capillaries that run parallel to the Loop of Henle.
Correct answer: Vasa recta- A. Constipation
- B. Micturation
- C. Hypertension
- D. Dehydration
Explanation: The anti-diuretic hormone (ADH), also known as vasopressin, is secreted by the posterior pituitary gland.
Correct answer: Dehydration- A. Five
- B. Three
- C. Two
- D. One
Explanation: Dialysis is a process used to remove waste products and excess fluid from the blood when the kidneys are not functioning properly.
Correct answer: Two- A. External, internal
- B. Internal, external
- C. Both A and B
- D. None of these
Explanation: Homeostasis refers to the body's ability to maintain a stable internal environment even when faced with external changes.
Correct answer: Internal, external- A. Receptors, Insulators, Effectors
- B. Receptors, Control Centers, Effectors
- C. Receptors, Suppressors, Effectors
- D. Receptors, Depressors, Effectors
Explanation: The correct components of a feedback mechanism are receptors, regulators, and effectors.
Correct answer: Receptors, Control Centers, Effectors- A. Metanephridia
- B. Protonephridia
- C. Flame cell
- D. None
Explanation: Hydra, a simple cnidarian, lacks specialized excretory organs such as metanephridia, protonephridia, or flame cells.
Correct answer: None- A. Solar energy
- B. Metabolism
- C. Muscle contraction
- D. Sweating
Explanation: The correct answer is Sweating. Sweating is a process used by organisms to cool down by releasing heat through evaporation of sweat from…
Correct answer: Sweating- A. Vacuole
- B. Cell membrane
- C. Cell wall
- D. All of these
Explanation: The correct answer is Cell wall. Plant cells are surrounded by a rigid cell wall that provides structural support and prevents the cell…
Correct answer: Cell wall- A. Hypotonic solution
- B. Hypertonic solution
- C. Isotonic solution
- D. None
Explanation: The correct answer is an isotonic solution. In this type of solution, the concentration of solutes is the same inside and outside the…
Correct answer: Isotonic solution- A. Pituitary gland
- B. Adrenal gland
- C. Parathyroid gland
- D. Thyroid gland
Explanation: The correct answer is the adrenal glands, which are located on top of each kidney.
Correct answer: Adrenal gland