Class 9 Exam > Class 9 Questions > In which phylum pseudocoelom is present ?a)Co...
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In which phylum pseudocoelom is present ?
- a)Coelenterata
- b)Annelida
- c)Aschelminthes
- d)Mollusca
Correct answer is option 'C'. Can you explain this answer?
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In which phylum pseudocoelom is present ?a)Coelenteratab)Annelidac)Asc...
Phylum Pseudocoelom
The phylum in which pseudocoelom is present is Aschelminthes. Here is a detailed explanation:
1. Coelenterata:
- Pseudocoelom is not present in the phylum Coelenterata.
- Coelenterates, such as jellyfish and sea anemones, have a simple body plan without a true body cavity.
2. Annelida:
- Annelids, such as earthworms and leeches, have a true coelom, which is a fluid-filled body cavity lined with mesoderm.
- They do not have a pseudocoelom.
3. Aschelminthes:
- Aschelminthes, also known as the "roundworms," possess a pseudocoelom.
- The pseudocoelom is a body cavity that is not fully lined with mesoderm, but rather only partially lined.
- Examples of organisms in this phylum include nematodes, rotifers, and hookworms.
4. Mollusca:
- Mollusks, such as snails, clams, and squids, have a true coelom.
- They do not possess a pseudocoelom.
Therefore, the correct answer is option C: Aschelminthes.
The phylum in which pseudocoelom is present is Aschelminthes. Here is a detailed explanation:
1. Coelenterata:
- Pseudocoelom is not present in the phylum Coelenterata.
- Coelenterates, such as jellyfish and sea anemones, have a simple body plan without a true body cavity.
2. Annelida:
- Annelids, such as earthworms and leeches, have a true coelom, which is a fluid-filled body cavity lined with mesoderm.
- They do not have a pseudocoelom.
3. Aschelminthes:
- Aschelminthes, also known as the "roundworms," possess a pseudocoelom.
- The pseudocoelom is a body cavity that is not fully lined with mesoderm, but rather only partially lined.
- Examples of organisms in this phylum include nematodes, rotifers, and hookworms.
4. Mollusca:
- Mollusks, such as snails, clams, and squids, have a true coelom.
- They do not possess a pseudocoelom.
Therefore, the correct answer is option C: Aschelminthes.
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In which phylum pseudocoelom is present ?a)Coelenteratab)Annelidac)Aschelminthesd)MolluscaCorrect answer is option 'C'. Can you explain this answer?
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