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

Define guidelines of school children and adolescents, Define Guidelines of ...

Define Guidelines of School Children and Adolescents? 1) Do not skip breakfast. At least have milk, fruit and cereal. Some children prefer to flavour the milk with cereal or pr

All part., Wat type of animal is tick and weevil?

Wat type of animal is tick and weevil?

Define the properties of fibre, Define the Properties of Fibre? The str...

Define the Properties of Fibre? The structural make up of fibre influences its properties which in turn affects the physiologic and metabolic roles. This is well-depicted in th

Explain the process of canning, Explain the Process of Canning? The bas...

Explain the Process of Canning? The basic principles of canning have not changed dramatically since Nicholas Appert and Peter Durand developed the process. Heat sufficient to d

Show some evolutionary advantages of animals, Q. What are some evolutionary...

Q. What are some evolutionary advantages of animals with complete digestive tube? The complete digestive tube permits animals to continuously feed themselves without waiting fo

Explain about thiol proteases, Explain about thiol proteases Group of  ...

Explain about thiol proteases Group of  thiol proteases, similar in structure to each other, are found in plants. These include  papain from the papaya fruit and  ficain from f

Genetics, discuss chromosomal theory of heredity.

discuss chromosomal theory of heredity.

Diseases caused by abnormal gh secretion by the hypophysis, Q. What are som...

Q. What are some diseases caused by abnormal GH secretion by the hypophysis? In childhood deficient GH secretion may lead to delayed growth and in severe cases to nanism that i

Which joint is stronger-the shoulder or hip joint, In general compare and c...

In general compare and contrast the three functional classifications of joints according to movement. What are two characteristics that make synovial joints unique and different fr

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