155
Question
Assertion :Organisms found in marine habitats, with skeletal spicule, made up of calcium carbonate, spongin or silicon, multicellular diploblastic body riddled with ostia, chambers and canals belong to a phylum of Animalia called as Proferia. Reason: All their members are with medusa and polyp form.
Assertion :Organisms found in marine habitats, with skeletal spicule, made up of calcium carbonate, spongin or silicon, multicellular diploblastic body riddled with ostia, chambers and canals belong to a phylum of Animalia called as Proferia. Reason: All their members are with medusa and polyp form.
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Solution
The correct option is C Assertion is correct but Reason is incorrect.
Phylum Porifera contains organisms, which are found in marine habitats, skeletal spicule is made up of calcium carbonate, spongin or silicon. They are multicellular organisms, that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.Medusa and polyp forms are not characteristic of poriferans but cnidarians.Hence, option C is correct.
Phylum Porifera contains organisms, which are found in marine habitats, skeletal spicule is made up of calcium carbonate, spongin or silicon. They are multicellular organisms, that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.
Medusa and polyp forms are not characteristic of poriferans but cnidarians.
Hence, option C is correct.
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