The osmoregulatory/excretory system of an earthworm is based on the operation of…a) protonephridia.b) metanephridia.c) Malpighian tubules.d) nephrons
Question
The osmoregulatory/excretory system of an earthworm is based on the operation of…a) protonephridia.b) metanephridia.c) Malpighian tubules.d) nephrons
Solution
The osmoregulatory/excretory system of an earthworm is based on the operation of metanephridia.
Here's a step-by-step explanation:
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Earthworms belong to the phylum Annelida, and their excretory system is composed of a pair of metanephridia in each segment of the body.
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Metanephridia are tube-like structures that open internally into the coelom (the main body cavity in many animals) and externally to the outside of the body.
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The internal opening of the metanephridium is surrounded by a funnel-like structure called the nephrostome, which filters waste materials from the coelomic fluid.
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These waste materials are then passed through the metanephridium and excreted outside the body.
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In addition to waste excretion, metanephridia also play a role in maintaining the earthworm's water and salt balance, a process known as osmoregulation.
So, the correct answer is b) metanephridia.
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