Formation of gemmules, Biology

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.

Posted Date: 2/5/2013 12:21:54 AM | Location : United States







Related Discussions:- Formation of gemmules, Assignment Help, Ask Question on Formation of gemmules, Get Answer, Expert's Help, Formation of gemmules Discussions

Write discussion on Formation of gemmules
Your posts are moderated
Related Questions
Phases of Menstrual Cycle - Reproduction Four phases of the menstrual cycle are usually distinguished: the menstrual, proliferative (follicular), ovulatory and progestational

A v i a n infectious bronchitis (IB) An acute, highly contagious respiratory disease of chicken caused by a member of the family Coronaviridae, IB was first recognized in I

Explain what is Mustard Operation ? The difference in Mustard operation is that either pericardium or polyester patch is used for making the inter atrial baffle. The baffle com

Determine the term Epitheliomuscular cell. Cells which line outer surface of cnidarians. These cell have two functions: first is to form the outer body covering of animal, seco

Coronal disassembly - Coronal restoration in the retreatment phase called coronal deassembling or disassemblying. - Coronal deassembling means removal of coronal and radi

How are lipids used as an energy source by the organism? Carbohydrates are the major energy source for aerobic cell respiration. In the absence or deficiency of such substances

Explain some side effects of carbohydrate loading? Some potential side effects of carbohydrate loading are: Muscle , stiffness Diarrhoea Chest Pain Depres

What are pentoses? What are the roles of pentoses in DNA and RNA molecules? Pentoses are carbohydrates made of five carbons. The DNA molecule is made of a sequence of molecu

Vein Grafts :  At the end of ten years only 50 per cent of saphenous vein grafts are paten1 and 50 per cent of the rest may have significant atherosclerotic changes. In a

How does phosphocreatine act in the muscle contraction and relaxation? Phosphocreatine is the main means of energy storage of the muscle cells. During relaxed periods ATP mo