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

How different is the amphibian heart from the fish heart, Q How different i...

Q How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous.

Explain what is genetic engineering, Explain brifly what is Genetic Enginee...

Explain brifly what is Genetic Engineering ? Genetic Engineering : Engineering techniques have been used in agriculture and horticulture for centuries. Certain plants or ani

Puberty, how does the hypothalamus begin puberty

how does the hypothalamus begin puberty

What are the enzyme cofactors, Q. What are the enzyme cofactors? Some o...

Q. What are the enzyme cofactors? Some of enzymes require other associated molecules to work. These molecules are known as enzyme cofactors and they can be, for example, organi

Define techniques for detection hidden root canals, Define Techniques for D...

Define Techniques for Detection Hidden Root Canals Three well-angulated periapical films for 3D morphology: o With the cone directed straight on. o Mesiobilque. o And disto

Major groups into which the study of the plants is divided, Q. What are the...

Q. What are the four major groups into which the study of the plants is divided? In Botany the plant kingdom is divided into pteridophytes, bryophytes, angiosperms and gymnospe

What is resting membrane potential of an axon, Action potentials include ch...

Action potentials include changes in the membrane potential of an axon, as shown in the schematic below. During the refractory period, sodium channels are inactivated and

New Technology, What is the best microscope to get a detailed view of the p...

What is the best microscope to get a detailed view of the parts inside of a preserved plant cell

Effects of failing to prepare adjusting entries, Failure to organize proper...

Failure to organize proper adjusting entries causes net income and the balance sheet to be in error. Using Micro Train Company as an instance this section has discussed and illustr

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