Test Your Knowledge with Comprehensive MCQs of Homeostasis
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(A) anisotonic; (B) isotonic; (C) hypotonic; (D) hypertonic
Answer: (D) Hypertonic
Explanation: A hypertonic environment has a higher solute concentration compared to the reference environment. In this case, the term "hypertonic" indicates a more concentrated environment.
Q2. The mango plant is:
(A) Mesophyte; (B) Hydrophyte; (C) Xerophyte; (D) None of the above
Answer: (A) Mesophyte
Explanation: Mesophytes are plants that are adapted to a moderate amount of water. The term "mesophyte" describes the plant's adaptation to a habitat with average water availability.
Q3. The excretory system of Planaria is called:
(A) Meteno Phridium (B) Protonephridium (C) Nephrone (D) Nephridium
Answer: (B) Protonephridium
Explanation: The excretory system of Planaria is called protonephridium. It is a network of tubules that helps in the osmoregulation and excretion of metabolic wastes.
Q4. In the urea cycle, one molecule of ammonia and one molecule of CO2 combine with one molecule of ornithine to form:
(A)Urea;a (B)Arginine;e (C)Arginosuccinate;e (D) Citrulline
Answer: (C) Arginosuccinate
Explanation: In the urea cycle, one molecule of ammonia and one molecule of carbon dioxide combine with one molecule of ornithine to form arginosuccinate.
Q5. Unlike an earthworm, metanephridia in mammalian nephrons:
(A) filters blood instead of coelomic fluid;
(B) Functions in both osmoregulation and excretion of nitrogenous wastes
(C) Forms urine by changing the composition of fluid inside the tubule.
(D) is intimately associated with a capillary network
Answer: (A) filters blood instead of coelomic fluid.
Explanation: Unlike an earthworm's metanephridia, mammalian nephrons filter blood instead of coelomic fluid. Nephrons are the functional units of the kidney.
Q6. Which process in the nephron is least selective?
(A) Filtration; (B) Transport across the epithelium of a collectingduct;t (C)Reabsorption;n (D) Secretion
Answer: (A) Filtration
Explanation: Filtration is the least selective process in the nephron. It involves the passive movement of water and solutes from the blood into the renal tubule.
Q7. Malpighian tubules are excretory organs found in:
(A)Vertebrates;s (B)Annelids;s (C)Insects;s (D) Flatworms
Answer: (C) Insects
Explanation: Malpighian tubules are excretory organs found in insects. They are involved in the removal of nitrogenous waste from the insect's body.
Q8. Ammonia is secreted by most
(A) Adult Amphibians (B) Organisms that produce eggs (C) Bony Fishes (D) Insects
Answer: (D) Insects
Explanation: Ammonia is commonly secreted by most insects as a primary nitrogenous waste product.
Q9. The vertebrate liver functions in all the following regulatory processes except:
(A) Detoxification ofharmful chemicals;s (B) Energy reserves in the formationof glycogen;n (C) Productionof nitrogenous wastes;s (D) Osmoregulation by variable excretion of salts
Answer: (D) Osmoregulation by variable excretion of salts
Explanation: The vertebrate liver is not directly involved in osmoregulation by the variable excretion of salts. It primarily functions in detoxification, energy storage, and the production of nitrogenous wastes.
(A) 1/10 (B) 1/20 (C) 1/5 (D) 1/50
Answer: (C) 1/5
Explanation: Urea is less toxic than ammonia, and it can be eliminated with a lower quantity of water compared to ammonia. Urea is the primary nitrogenous waste product in mammals and some other organisms.
Q12. Oxalates are present in:
(A) Meat; (B) Tomatoes; (C) Green Vegetables; (D) Green Vegetables and Tomatoes
Answer: (C) Green Vegetables
Explanation: Oxalates are compounds found in certain plants, particularly green leafy vegetables. They can also be present in other plant-based foods.
Q13. The movement of ground squirrels to burrow in midday heat is an:
(A) physiological adaptation; (B) structural adaptation; (C) behavioral adaptation; (D) morphological and physiological adaptation
Answer: (C) Behavioral adaptation
Explanation: The movement of a ground squirrel to burrow in midday heat represents a behavioral adaptation. Behavioral adaptations are actions that help an organism survive in its environment.
Q14. Normal body temperature:
(A) 36.1°C–37.8°C (B) 36.0°C-38.8°C (C) 36.7°C-37.8°C (D) 37.1°C-38.6°C
Answer: (C) 36.7°C-37.8°C
Explanation: The normal body temperature for a human typically falls within the range of 36.7°C to 37.8°C.
Q15. Hummingbirds belong to a category called:
(A) Heterotherm; (B) Poikilotherms; (C) Ectotherm; (D) Endotherm
Answer: (D) Endotherm
Explanation: Hummingbirds are endothermic animals, meaning they can regulate their body temperature internally.
Q16. Vasodilation:
(A) NucleicAcid;d (B) Increase the blood supply to theskin;n (C)Protein;n (D) ADH
Answer: (B) Increase the blood supply to the skin.
Explanation: Vasodilation is the widening of blood vessels, which increases blood flow to the skin. This helps in heat dissipation and is a response to regulating body temperature.
Q17. Nitrogenous base:
(A) Ectotherm (B) Protein (C) Nucleic Acid (D) ADH
Answer: (C) Nucleic Acid
Explanation: Nitrogenous bases are part of nucleic acids, which include DNA and RNA.
Q18. Reptile: (A) Protein (B) Ectotherm (C) Nucleic Acid (D) Increase the blood supply to the skin
Answer: (B) Ectotherm
Explanation: Reptiles are ectothermic, meaning their internal body temperature is primarily determined by external environmental conditions.
Q19. Collecting duct:
(A) ADH (B) Protein (C) Ectotherm (D): Increase the blood supply to the skin.
Answer: (A) ADH
Explanation: The collecting duct is a part of the nephron in the kidney and is involved in the reabsorption of water, regulated by the antidiuretic hormone (ADH).
Q20. Dialyzer: (A) 15%; (B) Kidney Machine; (C) Adrenal Cortex; (D) Presence of sweat gland
Answer: (B) Kidney Machine
Explanation: A dialyzer is a medical device used in a kidney machine (dialysis machine) to perform the function of the kidneys by removing waste products from the blood.
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