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

Sensor measures the current value of the controlled variable, In a properly...

In a properly functioning negative feedback system A. value of the controlled variable will always be very close to the threshold value when the system is in steady state.

Sponges, Ask qimporatance of sponge in tourism industry

Ask qimporatance of sponge in tourism industry

What is the function of the flagellum of the sperm cell, What is the functi...

What is the function of the flagellum of the sperm cell? How is it formed? The flagellum of the sperm cell is produced by the centrioles that migrate to the region posterior to

What is gametogenesis, What is the type of cell division that allows sexual...

What is the type of cell division that allows sexual reproduction? What is gametogenesis? Meiosis is the type of cell division that permits sexual reproduction since it decreas

Trans myocardial laser re vascularisation, Trans Myocardial laser re vascul...

Trans Myocardial laser re vascularisation (TMLR) :  Patients who have severe angina and diffuse coronary artery disease with no graftable vessels are at limes subjected to TMLR. I

Male accessory sex organs, Normal 0 false false false E...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Show germ layer from which the coeloms originate, Q. What is the germ layer...

Q. What is the germ layer from which the coeloms originate? The coeloms are deriving from mesoderm.

Things to do before an earthquake for minimizing losses, Things to do-  We ...

Things to do-  We ought to aide by earthquake resisting building codes during construction and retrofitting of existing buildings. We should have a first AID box handy and learn

How is the gastric mucosa protected from the acid ph, How is the gastric mu...

How is the gastric mucosa protected from the acid pH of the stomach? The gastric epithelium is mucus secretory, i.e., it makes mucus. The mucus covers the stomach wall preventi

State the term - psychophysiology, State the term - Psychophysiology Th...

State the term - Psychophysiology This refers to the study of psychological theories using physiological measures. In other words, psycho-physiologists normally try to understa

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