Hydra has no specialized excretory system because:
Correct answer: C. The whole body cells are in contact with water
- A. It does not produce waste material
- B. Due to absence of mesoderm
- C. The whole body cells are in contact with water
- D. It has pseudocoelom.
Explanation
Hydra has no specialised excretory organs because its simple body is surrounded by water and its cells can lose soluble wastes directly by diffusion. The likely mistake is pseudocoelom, but Hydra is a diploblastic animal and does not possess a pseudocoelom.
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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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