MINERAL NUTRITION Quiz 6 1. Marine fishes excrete (A) Ammonia (B) Urea (C) Uric acid (D) Both A and C 2. Animals accumulate NH3, Urea, Uric acid, CO2, H2O and Ions by (A) Metabolic activities (B) Excess ingestion (C) Excretion (D) Both A & B 3. Ammonia is converted to urea in _____________ & excreted out by_______________ (A) Kidneys, Urinary Bladder (B) Kidneys, PCT (C) Liver, Kidneys (D) Kidneys, Kidneys 4. Which is the least toxic form of nitrogenous waste? (A) Ammonia (B) Urea (C) Uric acid (D) Ions 5. Ammonia is converted into urea in (A) Kidney (B) Liver (C) Gall bladder (D) Urinary ducts 6. Which of the following group of animal/s is ammonotelic in nature? (A) Aquatic amphibians; marine fishes (B) Bony fishes (C) Reptiles (D) Insects 7. The Nitrogenous waste require least amount of water for its elimination is (A) Ammonia (B) Urea (C) Uric acid (D) Na^+, K^+, Cl^- 8. Which of the following statement is correct for ammonotelic animals? (I) Ammonia is readily soluble.(II) Ammonia is generally excreted by diffusion across the body surface.(III) Ammonia is mainly excreted by gills as NH3.(IV) Kidney plays a very significant role in its removal. (A) I, II, III, IV (B) I, II, III (C) II, III (D) I, II 9. The Nitrogenous waste require large amount of water for its elimination is (A) Ammonia (B) Urea (C) Uric acid (D) Na^+, K^+, Cl^- 10. Major form of nitrogenous waste is (A) Urea (B) CO2 (C) H2O (D) Ions 11. Which of the following group of animals is ureotelic in nature? (A) Mammals, Amphibians, Bony fishes (B) Terrestrial Amphibians, Marine fishes (C) Mammals, Land snails, Birds (D) Reptiles, Birds, Land snails 12. Why terrestrial adaptation necessitated the production of lesser toxic nitrogenous waste? (A) Kidney do not play any significant role where most nitrogenous waste formed. (B) To conserve water (C) Because ammonia is not produced in terrestrial animals. (D) As toxicity was killing the animals. 13. Major forms of nitrogenous wastes is/ are (A) Urea only (B) Ammonia & uric acid only (C) Both A and B (D) Ammonia only 14. Which is the most toxic form of nitrogenous waste? (A) Ammonia (B) Urea (C) Uric acid (D) Ions 15. Some amount of urea may be retained in the kidney matrix of some ureotelic animals to (A) Change the osmotic potential. (B) Maintain a desired osmolarity. (C) Form more urea in the kidney. (D) Conserve water. 1 out of Time is Up! Time's up
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