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 we can do karyotype analysis, Why in the preparation of a karyotype ana...

Why in the preparation of a karyotype analysis is the use of a substance like colchicine interesting? Colchicine is a substance that disallows the formation of microtubules and

Define the method for fractionation of subcellular organelle, Method for fr...

Method for fractionation of subcellular organelles In order to study the composition and the metabolic role of the various subcellular organelles in a cell, it becomes necessar

Determine the food sources of fluoride, Determine the Food Sources of Fluor...

Determine the Food Sources of Fluoride? The major source of fluoride in most diets is water, with foods providing only about 25% of total intake. These include tea and marine f

What is fluoride inhibitor, Fluoride Inhibitor Fluoride inhibits  enola...

Fluoride Inhibitor Fluoride inhibits  enolase enzyme involved in the conversion of 2-phosphoglerate  to phosphoenol pyruvate.

Can pathophysiology causes cardiovascular disease, Q. Can Pathophysiology c...

Q. Can Pathophysiology causes cardiovascular disease? Cigarette use activates platelets, increases circulating fibrinogen, increases heart rate, and elevates blood pressure. It

Class of mollusca - aplacophora, Class of Mollusca - Aplacophora Worm...

Class of Mollusca - Aplacophora Worm-like, no shell, head or excretory organs mantle with chitinous cuticle or scales or spicules mantle cavity posterior. Aplacophorans are a

In what form do plants absorb calcium from the soil, a) In what form do pla...

a) In what form do plants absorb calcium from the soil? b) List any two calcium deficiency symptoms in plants.

Difference between self pollination and cross pollination, What is the diff...

What is the difference between self pollination and cross pollination? Which of these two modes of pollination contributes more to the plant diversity? Self pollination happens

What are the two big groups into which cells are classified, Q What are the...

Q What are the two big groups into which cells are classified? Cells can be classified as prokaryotic or eukaryotic. Prokaryotic cell is that with no delimited nucleus. Eukaryo

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