Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Hydra – Metazoa
The animals of phyla Cnidaria and Ctenophora are made up of only two germ layers: ectoderm which forms the outer covering of the animal and endoderm which is the inner layer and is also known as the gastroderm. However, a non-cellular jelly like substance mesoglea is present between ectoderm and endoderm which acts as a cement to bind the two layers. This layer should not be confused with the third germ layer i.e. mesoderm. Since animals of these two phyla do not have mesoderm, they are said to be diploblastic.
Figure: L.S. Hydra
If we cut a longitudinal section through 'Hydra we see two distinct layers bound together by a non-cellular mesoglea. The two germ layers give rise to many different cell types - as evident from figure. Rest of the animals (platyhelminths to mammals) are all made up of three germ layers viz. ectoderm, endoderm and mesoderm. These animals are triploblastic. If we cut a section say through a horse (a mammal and triploblastic) can we expect to see three layers like you see two layers in diploblastic Hydra? No we will net, because these three germ layers do not .remain as such, they differentiate and modify to give rise to different structures and organs in the body of the horse. The three layers will be distinct only during early embryology. Hence we call them the embryonic layers or the germ layers.
How different are the concepts of action potential, resting potential and excitation threshold concerning neurons? Action potential is the maximum positive voltage level achiev
how does measurement of light scattering allows the growth of cells to be monitored.
Brasseler Endo Extractor tube Insert H file buccally and lingually and remove silver by friction.If I can't remove use solvent to desolve cement If the tip of silver not appear
Explain Energy demand for Sedentary or Light Activity Lifestyles? These people have occupations that do not demand much physical effort, are not required to walk long distances
Stress - Responses of Plants to Stress Let us recall what happens within the natural communities occupying the same habitat. The relative location of two plants may place them
Which of the branches of applied biology ?
Illustrate about the Ward Halstead and Luria The linear approach is best exemplified in the work of A.R. Luria and various collaborators, while the configurational approach is
Determine about the Klove Grooved Pegboard Test The subject must place pegs shaped like keys into a board having recesses that are oriented in randomly varying directions. The
For convenience, living things are placed into different groups. Taxonomic breakdown of living things comprises the following categories: Family, Class, Genus, Phylum, Order, K
Access Cavity Perforation - Types of Root Perforation Can occur during access cavity perforation (specially in anterior) Due to misdirection of bur during access cavit
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd