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Question
Classify the following organisms based on the absence/presence of true coelom (i.e, acoelomate, pseudocoelomate and coelomate)
Spongilla, Sea anemone, Planaria, Liverfluke Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
Classify the following organisms based on the absence/presence of true coelom (i.e, acoelomate, pseudocoelomate and coelomate)
Spongilla, Sea anemone, Planaria, Liverfluke Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
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Solution
The correct option is A (i)Acoelomate: Spongilla, Sea anemone, Planaria, Liver fluke.
(ii) Pseudocoelomate: Wuchereria, Ascaris.
(iii) Coelomate: Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
- Acoelomate - Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluid-filled cavity at their anterior, or head, end, which is used to eject the proboscis rapidly. The lack of a fluid-filled cavity adjacent to the muscles reduces the extent to which the muscles can contract and the force they exert. Other examples - Spongilla, sea anemone, Planaria, liver fluke, etc.
- Pseudocoelomate animals have a pseudocoelom (literally “false cavity”), which is a fully functional body cavity. Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. Thus, although organs are held in place loosely, they are not as well organized as in a coelomate. Example - Wuchereria, Ascaris.
- Coelomate animals or Coelomata ( "true coelom") have a fluid filled body cavity called a coelom with a complete lining called peritoneum derived from mesoderm. Example - Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
So, the correct answer is 'option A'
(ii) Pseudocoelomate: Wuchereria, Ascaris.
(iii) Coelomate: Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
- Acoelomate - Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluid-filled cavity at their anterior, or head, end, which is used to eject the proboscis rapidly. The lack of a fluid-filled cavity adjacent to the muscles reduces the extent to which the muscles can contract and the force they exert. Other examples - Spongilla, sea anemone, Planaria, liver fluke, etc.
- Pseudocoelomate animals have a pseudocoelom (literally “false cavity”), which is a fully functional body cavity. Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. Thus, although organs are held in place loosely, they are not as well organized as in a coelomate. Example - Wuchereria, Ascaris.
- Coelomate animals or Coelomata ( "true coelom") have a fluid filled body cavity called a coelom with a complete lining called peritoneum derived from mesoderm. Example - Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
So, the correct answer is 'option A'
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