basic information coelenterata
Answers
Coelenterata is a term encompassing the animal phyla Cnidaria and Ctenophora. it has the hollow body cavity common to these two phyla.
GENERAL CHARACTERISTICS OF COELENTARA:-
- Stinging cells.
- Two stages in life cycle (polyp & medusa)
- Blind sack gut.
- Radial symmetry.
- Diploblastic.
- Hydrostatic skeleton.
- Nerve net.
- Many colonial, some solitary forms.
Answer:
BASIC CHARACTERISTICS OF COELENTERATA:
These are typically invertebrate animals, which show a very simple level tissue organisation.
They are multicellular organisms, exhibiting tissue grade of the organisation.
They are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called the endoderm.
There is a non-cellular layer that is the mesoglea in between the ectoderm and the endoderm.
They show radial symmetry.
They have a single opening in the body through which food is taken in and also waste is expelled out.
Digestion takes place in the body cavity which is the coelenteron.
Digestion is both intracellular and extracellular.
Tentacles have special structures known as the nematocysts which help in capturing and paralyzing prey.
Respiration and excretion occur through simple diffusion.
The circulatory system is absent.
Asexual reproduction is seen in polyps, through budding and sexual reproduction is seen in medusa form, through gametic
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