Class 9 Exam > Class 9 Questions > Which phylum has a reduced coelomic cavity?a)...
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Which phylum has a reduced coelomic cavity?
- a)Phylum Nematoda
- b)Phylum Echinodermata
- c)Phylum Arthropoda
- d)Phylum Mollusca
Correct answer is option 'D'. Can you explain this answer?
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Which phylum has a reduced coelomic cavity?a)Phylum Nematodab)Phylum E...
Phylum Mollusca
Phylum Mollusca is the predominant phylum in marine environments. It is estimated that 23 percent of all known marine species are mollusks; there are over 75,000 described species, making them the second most diverse phylum of animals. The name “mollusca” signifies a soft body, since the earliest descriptions of mollusks came from observations of unshelled cuttlefish. Mollusks have a muscular foot, which is used for locomotion and anchorage, and varies in shape and function, depending on the type of mollusk under study. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is a retractable as well as an extendable organ. The foot is the ventral-most organ, whereas the mantle is the limiting dorsal organ. Mollusks are eucoelomate, but the coelomic cavity is restricted to a cavity around the heart in adult animals. The mantle cavity develops independently of the coelomic cavity.
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Which phylum has a reduced coelomic cavity?a)Phylum Nematodab)Phylum E...
A coelom is a hollow, fluid-filled cavity found in many living things, where it acts as a protective cushion for their internal organs. In some animals, such as worms, the coelom acts as a skeleton. The coelom also allows the internal organs to move and grow independently of the outer layer of the body wall.
Now we see what is phylum...in simple words we can define it that a phylum is a level of classification or taxonomic rank below Kingdom and above Class. There are 36 recognized animal phyla, of which but nine contain the vast majority of described, extant species.and Mollusca is one of them.
If we focus on the some basic features of Mollusca...then.
Some common features are :
▪Unsegmented soft body with bilateral symmetry.
▪Presence of an internal or external shell.
▪A toothed tongue (made mostly of chitin) called the radula.
▪A mantle which is a fold in the body wall that lines the shell.
▪Muscular foot (and/or tentacles in some).
●Here we see it has presence of external and internal shell....which leads to reduce the coelomic cavity..
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Which phylum has a reduced coelomic cavity?a)Phylum Nematodab)Phylum E...
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Which phylum has a reduced coelomic cavity?a)Phylum Nematodab)Phylum Echinodermatac)Phylum Arthropodad)Phylum MolluscaCorrect answer is option 'D'. Can you explain this answer?
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