The nephridia of earthworm open into the coelom by_________?
Correct answer: A. Nephrostome
- A. Nephrostome
- B. Nephridiopore
- C. Flame cell
- D. Anus
Explanation
The nephrostome is the funnel-shaped opening through which an earthworm's nephridium receives fluid from the coelom. A nephridiopore opens to the outside, while the anus belongs to the digestive tract; students commonly choose nephridiopore by confusing entry with exit.
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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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