Which of the following openings have cilia?
Correct answer: A. Nephrostome
- A. Nephrostome
- B. Nephridiopore
- C. Both of these
- D. None of these
Explanation
The nephrostome of an earthworm has cilia that create a current and draw coelomic fluid into the nephridium. The nephridiopore is an external outlet and is not the ciliated funnel, so choosing both confuses the two openings.
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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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