Give characters of Porifera Mesoderm only lining ectoderm but not digestive trac

Question

Give characters of Porifera Mesoderm only lining ectoderm but not digestive tract A)acoelomate B) coelomate C) pseudocoelomate D) all of these Sponges feed with special cells A) cnidocytes B) amoebocytes C) fibrocytes D) choanocytes Distinguish between protostome and deuterostome development Animal having bell shaped body with tentacles, gastrovascular cavity divided into canals A) Obelia B) sea anemone C) moon jelly D) Hydra Cnidarians surround them with lime and look rock like A) jellies B) hydrozoans C) flat worms D) corals Animal with a float tentacles specialized polyps for capturing food A) jelly fish B) Physala C) Obelia D) Squid Distinguish between 2 types of symmetry in animals and give significance for each How do cnidocytes help in survival? In glass sponges spicules are made of ____ and -rayed Draw the phylogenetic tree for animals and give its significance.

Explanation / Answer

(1) Porifera are pore-bearing free-living organisms. Their body is asymmetrical and are developed from two cell layers. They are sessile and have special cells for digestion and support. They are bisexual and have filter feeders, the digestion is intracellular and comprise spicules and spongins as structural elements.
(2) d. All of these
(3) d. Choanoncytes
(4) The protostomes contain more phyla and species than deuterostomes do.
           (a) In protostomes, the mouth is formed from the blastopore, whereas in deuterostomes, the blastophore forms the anus.
            (b) Protostomes have a spiral cleavage whereas, deuterostomes have a radial cleavage.
            (c) In protosotomes, the fate of the cells is formed through cleavage but not in deuterostomes.
            (d) Protostomes contain schizocoelomates and priapulids, whereas deuterostomes are enterocoelus.
            (e) Deuterostomes form Archenteron, but protostomes do not.
(5) c. moon jelly

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