Formation of gemmules, Biology

Assignment Help:

Formation of Gemmules

Throughout the formation of gemmules, masses of food - laden amoebocytes called archaeocytes feed on other cells and lay down in within them. They get surrounded by spongiocytes (other kind of amoebocytes). The latter secrete a two layered hard covering. A tiny pore, the micropyle, is left as a small opening in this protective shell. After that, some scleroblasts (spicule-producing cells) come to lie among the two layers of the shell and produce spicules. The gemmules are now finished. The parent sponge may now disintegrate leaving behind the gemmules. On revival of favorable conditions, the gemmules begin development. The centrally located archaeocytes emerge out by the micropyle as a mass which undergoes cell division and differentiation to generate a new sponge.


Related Discussions:- Formation of gemmules

Stages of research process, Stages of Research Process: Planning Stage...

Stages of Research Process: Planning Stage The planning stage of research process  includes a  series of  interdependent steps consisting of 1)  conceptualizatioq of  the r

What is aprecise diagnosis, Q. What is Aprecise diagnosis? Aprecise dia...

Q. What is Aprecise diagnosis? Aprecise diagnosis is necessary to establish the mode of therapy. Patients with initial blood phenylketonuria level of 121 m moll1 (> 2 mg/dl) sh

Facilitation model - models of succession, Facilitation Model - Models of S...

Facilitation Model - Models of Succession This is considered as the classical model of succession. It is based on the assumption that species of a previous stage are replaced

Express the monomer unit of a protein, Describe the monomer unit of a prote...

Describe the monomer unit of a protein and how monomer units are assembled into peptides.

Head examination of new born, Head - check for size, shape or fontan...

Head - check for size, shape or fontanelles, caput, or any other abnormality. Fontanel - anterior fontanel is diamond shaped having size of 2.5 - 4.5 cms. It close

Homeostasis solution, In biology, Homeostasis is the ability of an open pro...

In biology, Homeostasis is the ability of an open program to manage its internal environment to sustain constant circumstances through several energetic stability improvements mana

Express the term - amnion, Express the term - Amnion One of the extraem...

Express the term - Amnion One of the extraembryonic membranes found in terrestrial vertebrate. The amnion is filled with fluid and the developing embryo of reptiles, birds, and

Define the symptoms in blood of pernicious anaemia, Define the Symptoms in ...

Define the Symptoms in Blood of Pernicious Anaemia? Blood: The RBC count is low-1.5-2.5 million per mm 3 (normal range is 4.5- 5.5 million per mm 3 ). The average diameter o

Urinary system, Structures that l pyramidenaform the r

Structures that l pyramidenaform the r

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