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Taxonomic Hierarchy

Organisms wit...

Question

Organisms with ostia and osculum are in which phylum?

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Solution

The organisms of phylum Porifera have water canal system that is composed of ostia and osculum. Water enters through minute pores called ostia into the body cavity, from where it goes out through osculum.

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Q. The statements given below shows some characteristics of a phylum. identify it.
(i) Tissue absent
(ii) Internal fertilisation
(iii) Development is indirect
(iv) Spongocoelate with ostia (many) and single osculum and canal system
(v) Sexes are hermaphrodite.

Q. Assertion :Leucosolenia shows ascon type of canal system Reason: In Leucosolenia water passes through ostia

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Q. 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.

Q. Identify the correct statement with respect to phylum Coelenterata.

Statement 1: All the organisms are aquatic.

Statement 2: All the organisms of phylum Coelenterata live in colonies.

Q. Organisms found in marine habitats, with skeletal spicules made of calcium carbonate, spongin or silica, multicellular diploblastic body riddled with ostia, chambers and canals, belong to

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