Protonephridia are present in____________?
Correct answer: B. Flateworm
- A. Round worms
- B. Flateworm
- C. Tape worms
- D. Segmented worms
Explanation
Protonephridia are flame-cell excretory systems found in flatworms, including planarians and tapeworms. Students may choose roundworms because they also have a simple excretory system, but roundworms possess excretory canals or gland cells rather than protonephridia.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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