Characteristic features of phylum cnidaria, Biology

Characteristic features of Phylum Cnidaria

  • All are aquatic animals.
  • Radial or biradial symmetry around an oro-aboral axis, but no head.
  • Diploblastic, with an epidermis and a gastrodermis, and a less cellular or non- cellular, gelatinous mesoglea in between.
  • A gastrovascular cavity with a single opening, the mouth; tentacles encircling the oral region.
  • No coelom, respiratory system or separate excretory.
  • Nave net, for diffuse conduction only, present. Some sensory organs also occur.
  • No distinct muscle tissue, but epithelia - muscular system is present.
  • Two forms of individuals - benthic polyps and pelagic medusae - occur. Polyps usually reproduce asexually, budding sexual medusae. Sexual reproduction in all medusae and some polyps, involving gametes. Cleavage holoblastic and indeterminate.
Posted Date: 1/22/2013 11:48:33 PM | Location : United States







Related Discussions:- Characteristic features of phylum cnidaria, Assignment Help, Ask Question on Characteristic features of phylum cnidaria, Get Answer, Expert's Help, Characteristic features of phylum cnidaria Discussions

Write discussion on Characteristic features of phylum cnidaria
Your posts are moderated
Related Questions
What is a glucose tolerance test? A glucose tolerance test, usually conducted in the 24 to 28 weeks of pregnancy measures levels of sugar (glucose) in the mother's blood. Abnor

Nutrition, Feeding, Digestion All organisms require a fairly steady supply of nutrient materials from the environment to obtain energy in order to stay alive. The animals are

Minerals and reproduction The mechanism of mineral-reproduction interactions is not fully understood because  of the complexity of neuro-hormonal dialogue. Some minerals act direc

Q. What is the cellular structure to which mRNA molecules bind to start the protein synthesis? To make proteins mRNA molecules essentially associate to ribosomes. Ribosomes hav

CARBOHYDR A TES Carbohydrate = hydrate of carbon. Hydroxyl group present. Aldehyde group or keto group may present. Carbohydrates are polyhydroxy aldehydes

What are trophic levels? How many trophic levels can a food chain have? The Trophic levels correspond to positions on a food chain. thus producers always belong to the first tr

Define Classification of Carbohydrates? Carbohydrates are defined as polyhydroxy aldehydes or ketones or substances that produce such compounds when hydrolyzed. Carbohydrates a

Grasping instruments -Plier or clamp forceps -put piece of rubber in the plier                                 -applied on the buccal and lingual surface -make pressure to

How are triglycerides made? Triglycerides, fats or oils, are made of three molecules of fatty acids bound to single molecule of glycerol. Hydroxyls of each one of the three fat

What are the typical vegetation and the typical fauna of the taigas? Taiga, or the boreal forest, is characterized by coniferous trees, pine forests. There are also mosses, lic