The primary excretory organs found in earthworms are:
Correct answer: C. Metanephridia
- A. Flame cells
- B. Malpighian tubules
- C. Metanephridia
- D. Nephridiophores
Explanation
The correct answer is Metanephridia. Earthworms possess metanephridia, which are tubular excretory structures that filter fluid from the coelom and expel waste products from the body. This system helps maintain homeostasis by regulating the composition of body fluids. Flame cells and Malpighian tubules are incorrect as they are associated with different organisms, such as flatworms and insects, respectively. Nephridiophores are not excretory organs, and thus, do not apply to the excretory system of earthworms.
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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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