The excretory organ of Hydra is:
Correct answer: D. None
- A. Metanephridia
- B. Protonephridia
- C. Flame cell
- D. None
Explanation
Hydra, a simple cnidarian, lacks specialized excretory organs such as metanephridia, protonephridia, or flame cells. Instead, Hydra utilizes simple diffusion across its cell membranes to expel waste products due to its simple body structure and aquatic habitat. The other options listed are relevant to more complex organisms or different phyla.
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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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