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Which one of the following is NOT a characteristic of phylum Annelida? [2008]
- a)Closed circulatory system
- b)Segmentation
- c)Pseudocoelom
- d)Ventral nerve cord
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following is NOT a characteristic of phylum Annelida?...
Characteristic of phylum-Annelida is pseudocoelomate. Pseudocoelomate is any invertebrate animal whose body cavity is a pseudocoel, a cavity between the gut and the outer body wall derived from a persistent blastocoel, rather than a true coelom. Pseudocoelomate animal include the Rotifera and Nematoda. No, invertebrates do not have a dorsal nerve cord. Instead, invertebrates have a ventral nerve cord.
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Which one of the following is NOT a characteristic of phylum Annelida?...
Phylum Annelida, also known as annelids, is a diverse group of segmented worms that exhibit several characteristic features. However, one of these features is not present in this phylum. Let's analyze each option to understand why:
a) Closed circulatory system: Annelids have a closed circulatory system, where blood is confined within vessels and pumped by a heart. This allows for more efficient transport of oxygen and nutrients throughout the body.
b) Segmentation: Annelids are characterized by their segmented body plan. This segmentation is evident externally as well as internally, with each segment containing its own set of organs and structures. This allows for greater flexibility and specialization of body regions.
c) Pseudocoelom: This option is the correct answer. Annelids have a true coelom, which is a fluid-filled body cavity completely lined by mesoderm. A pseudocoelom, on the other hand, is a body cavity that is only partially lined by mesoderm. Phylum Annelida does not possess a pseudocoelom.
d) Ventral nerve cord: Annelids have a ventral nerve cord that runs along the underside of the body. This nerve cord serves as the main communication pathway for transmitting signals between the brain and the rest of the body.
In summary, the characteristic that is NOT present in phylum Annelida is a pseudocoelom. Annelids have a true coelom instead, which is a fully lined body cavity.
a) Closed circulatory system: Annelids have a closed circulatory system, where blood is confined within vessels and pumped by a heart. This allows for more efficient transport of oxygen and nutrients throughout the body.
b) Segmentation: Annelids are characterized by their segmented body plan. This segmentation is evident externally as well as internally, with each segment containing its own set of organs and structures. This allows for greater flexibility and specialization of body regions.
c) Pseudocoelom: This option is the correct answer. Annelids have a true coelom, which is a fluid-filled body cavity completely lined by mesoderm. A pseudocoelom, on the other hand, is a body cavity that is only partially lined by mesoderm. Phylum Annelida does not possess a pseudocoelom.
d) Ventral nerve cord: Annelids have a ventral nerve cord that runs along the underside of the body. This nerve cord serves as the main communication pathway for transmitting signals between the brain and the rest of the body.
In summary, the characteristic that is NOT present in phylum Annelida is a pseudocoelom. Annelids have a true coelom instead, which is a fully lined body cavity.
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Which one of the following is NOT a characteristic of phylum Annelida? [2008]a)Closed circulatory systemb)Segmentationc)Pseudocoelomd)Ventral nerve cordCorrect answer is option 'C'. Can you explain this answer?
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