The tubular excretory system of earthworm consists of:
Correct answer: D. Metanephridia
- A. Protonephridia
- B. Coxal gland
- C. Malpighian tubules
- D. Metanephridia
Explanation
Metanephridia are more complex excretory structures found in some invertebrates, such as earthworms. They consist of tubules with ciliated funnels called nephrostomes that filter coelomic fluid, reabsorb valuable substances, and excrete waste into the environment through an external opening called the nephridiopore. Metanephridia play a role in osmoregulation and waste elimination in these organisms.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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