Types of individuals in cnidaria, Biology

Types of individuals in Cnidaria

There are two forms of individuals in Cnidaria:

  1. Polyp
  2. Medusa

Polyp is tubular, the oral end being free carrying a whorl of tentacles, and the aboral end attached to the substratum by the basal disc. The polyp is sedentary, benthic type. The medusa is the free-swimming umbrella-like pelagic form, with mouth at the end of the manubrium on the subumbrella side. Though polyp and medusa may appear to be quite different in form, they have basically the same plan with an outer layer of epidermis and a gastrodermis lining the gastrovascular activity with a gelatinous layer of mesoglea in between them. The mesoglea in the medusa is, however thicker (hence the term jelly fishes), and one form can be theoretically derived from the other. The gastrovascular cavity servers as the alimentary canal opening to the outside through just only one opening the mouth.

Posted Date: 1/23/2013 12:09:43 AM | Location : United States







Related Discussions:- Types of individuals in cnidaria, Assignment Help, Ask Question on Types of individuals in cnidaria, Get Answer, Expert's Help, Types of individuals in cnidaria Discussions

Write discussion on Types of individuals in cnidaria
Your posts are moderated
Related Questions
Beta decay  is the type of radioactive decay in which the radioisotope emits a little negatively-charged and fast-moving particle from its nucleus. A beta particle is almost simila

Q. After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described? In a schematic longitudinal section of the embryo after

Define requirements of Vitamin A of infants? On the basis of vitamin A ingested by breast fed infants in well-nourished communities, ICMR (1990) has recommended a daily allowan

If a cell were placed in a hypertonic solution what could it do to protect itself?

What are some functions of the epithelium? The epithelial tissues can do covering, impermeability and protection against the environment, for instance, in the skin, resorption

What are genetic mutations? The Genetic mutations are alterations of the genetic material (compared to the normal condition of the species) involving modifications in the norma

what is origin ofspharosome

Define the Dietary and Lifestyle Modifications - Obesity? The management of obesity basically comprises the following three- pronged approach. a) Dietary modifications b)

What are the fruiting bodies present in some fungi? Fruiting bodies are structures made of hyphae that project radially from the superior portion of the peduncle of some fungi.

Which are the brain regions associated with memory? According to researchers some of the main regions of the nervous system associated with the memory phenomenon are the hippoc