Phylum Cnidaria (Coelenterata) General characteristics.
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- čas přidán 8. 09. 2024
- The phylum’s name is derived from the Greek root word cnid- meaning nettle, a stinging plant. Cnidarians are found in many aquatic environments. Sea anemones are widely distributed, from cold arctic waters to the equator, from shallow tide pools to the bottom of the deep ocean. Jellyfish float near the surface of the open oceans and in some tropical freshwater lakes. Corals are found primarily in shallow tropical waters, but a few grow in deep cold ocean waters. Small anemone-like cnidarians like Hydra sp. are also found in freshwater lakes and streams.
n the phylum Porifera we saw a body formed of aggregated cells with no organization into tissue layers or organs. Cnidarians have a slightly more organized body plan, and have tissues, but no organs. Most cnidarians have two tissue layers. The outer layer, the ectoderm, has cells that aid in capturing food and cells that secrete mucus. The inner layer, the endoderm, has cells that produce digestive enzymes and break up food particles. The jellylike material between the two layers is called the mesoglea. All of these body layers surround a central cavity called the gastrovascular cavity, which extends into the hollow tentacles.
The body plans cnidarians generally have radial symmetry.
Many cnidarians take two main structural forms during their life cycles, a polyp form and a medusa form.
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make video on ctenophora also please fast
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Sir ap na kaha ya acoelomates hoten ha body cavity nh hoti to diagram ma ap na konsi cavity ka zikr kya ha jesy ap na gastrovascular cavity kaha ha ???? Please sir reply...
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In our book it said that in aceolomates there is mesoderm and in diploblastic mesoderm is absent
sir ur lecture is so benifit for us but i think this phylum is not ascelomate b/c body cavity is present i.e gastrovascular cavity and their extracellular digestion is in body cavity
Cnideria phyllum is acoelomate.. sir is ✅️
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Sir no video on ctenophora?
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Brother,in colentrata class- cubozoa is not polyp and medusa
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Hydra ?
Sir echinodermatta b to radially symmetrical hen to hum ne unko akhiri men q rakha hum cnideria k bad b to rakh sakty the
Coz isme higher category Waly animals aty h ,, aur Coelenterata mein lower category Waly animals
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Sir ji sorry but.... Coelentrata me body cavity hoti he.... Gastro vascular cavity
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