Identify fish group which excretes urea as the primary nitrogenous end product:
(A) Teleost fishes
(B) Lung fishes
(C) Elasmobranch fishes
(D) None of these
Answers
Answer:
(C) Elasmobranch fishes
Explanation:
- Elasmobranchii is a subclass of cartilaginous fish (Chondrichthyes) that includes sawfish, rays, skates, and sharks. These have 5 to 7 pairs of gill clefts opening, small placoid scales on the skin, and rigid dorsal fins. Their major or primary nitrogen excretory product is urea and the urea level of marine elasmobranch’s plasma and tissue is also similar (approximately 350 mM).
- Most teleosts excrete 80-90% of their nitrogenous wastes are ammonia and the remaining as urea. Hence, their primary excretory product is not urea.
- Similarly, lungfishes (specifically African lungfish) are ammonotelic but become ureotelic after feeding and increase the rate of urea synthesis.
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Answer:
(C) Elasmobranch fishes
Explanation:
Elasmobranchii is a subclass of cartilaginous fish (Chondrichthyes) that consists of sawfish, rays, skates, and sharks. These have five to 7 pairs of gill clefts opening, small placoid scales at the skin, and inflexible dorsal fins. Their essential or number one nitrogen excretory product is urea and the urea stage of marine elasmobranch’s plasma and tissue is likewise similar (about 350 mM).
Most teleosts excrete 80-90% in their nitrogenous wastes are ammonia and the closing as urea. Hence, their number one excretory product isn't urea.
Similarly, lungfishes (particularly African lungfish) are ammonotelic however emerge as ureotelic after feeding and boom the charge of urea synthesis.
Write two important characteristics of Elasmobrance fishes
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are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.
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