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

General biology , What organic molecules make up the cell membrane?

What organic molecules make up the cell membrane?

DNA, where does the free nucleotides present in the nucleus come from

where does the free nucleotides present in the nucleus come from

Evolution of man, diffrentiate between javaman and peckingman

diffrentiate between javaman and peckingman

Explain doxycycline, Explain Doxycycline Doxycycline, which frequently c...

Explain Doxycycline Doxycycline, which frequently causes gastrointestinal disturbances and can cause photosensitivity and vaginitis, offers an inexpensive once-daily alternative

Lungs, what is the lungs structure in relation to the excretory system?

what is the lungs structure in relation to the excretory system?

What is oligosaccharides , Oligosaccharides are short chains of m...

Oligosaccharides are short chains of monosaccharides linked together by glycosidic bonds. In case of oligosaccharides  linked to proteins (glycoproteins)  or lipids (glycolipids) o

What is the critical photoperiod, What is the critical photoperiod? How can...

What is the critical photoperiod? How can the critical photoperiod relate to flowering be experimentally determined? The critical photoperiod is the limit of the photoperiod du

Spermiogenesis - spermatogenesis, Spermiogenesis - Spermatogenesis At ...

Spermiogenesis - Spermatogenesis At the end of the meiosis the spermatids appear as simple spherical cells with a centrally located nucleus. Their differentiation into sperm r

Etiologic factor of congestive cardiac failure, Q. Etiologic factor of Cong...

Q. Etiologic factor of Congestive Cardiac Failure? Congestive heart failure develops over a period of time when the necrotic tissues are not replaced by functional connective c

What are the most important worm infections, Q. What are the most important...

Q. What are the most important worm infections? The most significant human worm infections are taeniasis, schistosomiasis, cysticercosis, ascariasis and ancylostomiasis (hookwo

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