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
Q. Can you explain Tannins? Tannins are another class of compounds which interfere with the absorption of minerals like iron and reduce the availability of proteins by bindin

Explain the Working Principle of Spectrophotometer? The working principle of spectrophotometer is graphically presented in Figure. Figure: Working princip

Protein Synthesis The central dogma of modern biochemistry is totally based on the coded information holds within deoxyribonucleic acid (DNA). Double stranded DNA is converted

Clinical Manifestation Occurs over an extended time period and mimic those of CHF and corpulmonale. Dyspnea on exertion, dependent odema, ascitis, fatigue, anorexia and weight

Long-term responses - Behaviour of Plants Plants alter their course of development to suit the prevailing environmental conditions. For example, leaf maturation and fall, onse

Special type of Wards: Additional  accommodation or differences  in size and shape of some of  the special type of wards e.g. Intensive Care Ward, Infectious diseases ward and

Q What is the difference between catabolism and anabolism? Metabolism comprises two opposing processes: catabolism and anabolism. Anabolism is a set of synthesis reactions that

Functions of Ovary The ovary of vertebrates performs the following functions:   Production of eggs, Synthesis of hormones needed for the chemical coordination of repr

Q. Nutrition Management Goals for oesophagitis? The objectives of nutritional care include the following: 1. Prevention of irritation of the inflamed oesophageal mucosa (in

Viruses Viruses are sub cellular, ultramicroscopic infectious agents of 20 nm-300 nm size range Many of them cause diseases like polio, dengue, small pox, measles, rabies, com