Cnidarla, Biology

Assignment Help:

Tlie phylum Cnidaria or Coelenterata, includes the faliiiliar hydras, jelly fishes, sea anemones and corals. You have olreacly studied about Cnidarialis in Units 4 and 7 of LSE-09 course. These are often brilliantly colourcd. They exhibit radial symnietry, The Cnidarians possess two basic metazoall structural features. Onc, there is an intenla1 space for digestion, called in Cnidarinns as gastrovascular cavity. This cavity lies along the polar axis of the animal atid opens to tlie outside at one end to for111 noutli, Tlie presence of a mouth a~id digestive cavity permits the use of a mucll greater rnlige of food sizes than is possible in tlie protozoarls and sponges. Two, in Clidariails a circle of tentacles, representing exte~lsiolls of the body wall, surrounds tlie ~lioiltli to aid in tlie capture and ingestion of food. Tlie Cnidarian body wall consists of three basic layers: an outer lnycr of cpidennis, nn inner layer of elidoder~nal cells lining Ilie gastrovnscilar cavity, and between these two a layer called mesoglea. The rnesoglea ranges from n tliin, non cellilar membranc to a thick, fibrous, jelly-like, coid lnaterial with or without wanderillg a~noebocytes, A considerable number of different cell types compose tlie epidermis and gastrader~nis, but there is only a limited degree of organ development.


Related Discussions:- Cnidarla

Wace, Excretory organ of lizard.

Excretory organ of lizard.

Cell theory to be developed after microscopes, Why did it take 150 years fo...

Why did it take 150 years for the cell theory to be developed after microscopes were invented? Information about cells could not be understood and organized into a central theo

Can we make artificial cells, Q. Can we make artificial cells? Research...

Q. Can we make artificial cells? Research in progress at the "National Aeronautical and Space Administration (NASA)" is focused on artificial cells as a means to deliver medici

Hybrid sterility, Hybrid sterility can be regarded as yet another form of i...

Hybrid sterility can be regarded as yet another form of interspecific sterility. The offspring of the interspecific crosses are mainly sterile. Geological studies have shown that t

Meiosis, How do meiosis do in developing of new varieties of crops

How do meiosis do in developing of new varieties of crops

Types of ecosystem, Types of Ecosystem Basically ecosystems are of two ...

Types of Ecosystem Basically ecosystems are of two types : terrestrial and aquatic. If you travel from plains to the mountains in the Himalayas, you notice significant changes

What are the symptoms associated with campylobacteriosis, What are the symp...

What are the symptoms and foods associated with campylobacteriosis?  Campylobacteriosis incubation period: 2-5 days after ingestion of contaminated food.  Symptoms: Diarrhoe

How are bacteria are classified, Q. How are bacteria are classified accordi...

Q. How are bacteria are classified according to their need for oxygen? According to their need of oxygen bacteria are classified into anaerobic those that survive without oxyge

Make a sketch of a petroleum trap, Create a sketch of a petroleum trap. Wri...

Create a sketch of a petroleum trap. Write a history for how it came to the present (sketched) form following the rules of logical deduction.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd