EXCRETORY SYSTEM

• Where are the kidneys located in a frog's body?A)Abdomen 

  B) Thora 

  C) Head 

  D) Pelvis
• 2. What structures in the kidneys of a frog are responsible for filtering waste from the blood? 

  A)Glomeruli 

  B) Nephrons 

  C) Tubules 

  D) Ureter
• 3. Why do tadpoles excrete ammonia instead of urea? Choose the best answer. A) Tadpoles have a higher tolerance for ammonia compared to urea. 

  B) Tadpoles live in aquatic environments where ammonia is easier to excrete. 

  C) Tadpoles have pronephric kidneys that cannot convert ammonia to urea. 

  D) Tadpoles have a more efficient system for excreting ammonia. 
• 4. What is the primary site of water reabsorption in a frog's kidneys? 

  A)Glomeruli 

  B) Nephrons 

  C) Renal pelvis 

  D) Collecting ducts
• 5. I. As blood flows into each nephron, it enters the glomerulus. 

  II. The thin walls of the glomerulus allow larger molecules, wastes, and fluid—mostly water—to pass into the tubule. 

  III. Smaller molecules, such as proteins and blood cells, stay in the blood vessel. 

  A)Statements I, II, and III are true. 

  B) Only statement I is true. 

  C) Only statement II is true. 

  D) Only statement III is true. 
• 6. How do frogs eliminate excess water from their bodies? 

  A)Through their skin 

  B) Through their lungs 

  C) Through their cloaca 

  D) Through their rectum 
• 7. I. Ureter 

  II. Urinary Bladder 

  III. Nephrons 

  IV. Glomerulus 

  V. Cloaca 

  A)IV, III, I, II, V 

  B) III, IV, I, II, V 

  C) III, IV, II, I, V 

  D) IV, I, III, II, V
• 8. I. Each frog has about 1 million nephrons. II.Cortical nephrons (about 80% of all nephrons) mainly perform excretory and regulatory functions. 

  III. Juxtamedullary nephrons (about 20% of nephrons) concentrate and dilute urine. 

  A)Statements I, II, and III are true. 

  B) Statements II and III are true. 

  C) Statements I and III are true. 

  D) Only statement III is true.
• 9. For every 1 gram of ammonia, it requires approximately 500 mL of water for excretion. How about for every gram of urea? 

  A)0.5 mL 

  B) 5 mL 

  C) 50 mL 

  D) 100 mL
• 10. Why is “palakang bukid” safe to eat? Choose the best answer. 

  A)It is a herbivorous species. 

  B) It is naturally immune to harmful substances in its environment. 

  C) It undergoes a detoxification process in its excretory system. 

  D) It is a terrestrial frog containing low concentration of toxins in its body.