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

Do fats with one or more ''kinky'' tail fatty acids, Do fats with one or mo...

Do fats with one or more 'kinky' tail fatty acids tend to be solid or liquid at room temperature? These are found in triglycerides forming what? Solid fats or oils? Is it opposite

What is reduction, What is reduction? The most commonly understood defi...

What is reduction? The most commonly understood definition of reduction is the removal of oxygen or addition of hydrogen ions. However, chemically, reduction can be defined as

Human eye, by our eyes we can see the beautiful world but is there anything...

by our eyes we can see the beautiful world but is there anything in our eyes which makes it beauiful??

Do squids and octopus have exoskeleton, Q. Do squids and octopus have exosk...

Q. Do squids and octopus have exoskeleton? Squids and Octopus generally do not produce external shell (some squid species can have an internal shell). One cephalopod group the

How different are animal cells from plant cells, How different are animal c...

How different are animal cells from plant cells? Whereas plant cells are eukaryotic, autotrophic, photosynthetic and have chloroplasts and cell wall, the animal cells are eukar

Transport of substances done across the bryophyte tissue, How is the transp...

How is the transport of substances done across the bryophyte tissues? How is this feature related to the general size of these plants? In bryophytes there are no water-conduct

Sphaerosome, Sphaerosome Also known as Plant lysosome , because the...

Sphaerosome Also known as Plant lysosome , because they contain hydrolytic enzymes. Hanstei n first observed them and called microsomes . Discovered by Dangeared

Write the meaning of insulin, Q. Write the meaning of insulin? Insulin ...

Q. Write the meaning of insulin? Insulin is a hormone. And like many hormones, insulin is a protein. Insulin is secreted by groups of cells within the pancreas called islet cel

Microtubules, MICROTUBULES Discovered by De Robertis and Franchi ...

MICROTUBULES Discovered by De Robertis and Franchi . Term given by Slautterback . These are hollow structures, consists of tubulin protein. Each protein diamer

Explain the nutritional and functional role of iron, Minerals :- Iron ...

Minerals :- Iron Food Source      Cereals, legumes, meat contamination from iron utensils and soil Nutritional Functional role Essential nutrient: Deficiency lead

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