Table of Contents
What are gemmules where and why these are formed?
Gemmules are internal buds formed inside freshwater sponges, e.g. Spongilla. These are formed during unfavourable conditions and help in perennation and dispersal.
Why do sponges reproduce sexually?
Sponges may reproduce sexually and asexually. This helps keep them alive in their habitats. Most sponges are both male and female. In sexual reproduction, they may play either role.
Where are gemmules located in sponge?
Found in sponges, gemmules are internal buds (embryonic shoot), which plays a significant role in asexual reproduction. In other words, you can define what is gemmules as a cluster of cells capable of growing into an adult sponge.
What is the Pinacocytes function?
Function. Pinacocytes are part of the epithelium in sponges. They play a role in movement (contracting and stretching), cell adhesion, signaling, phagocytosis, and polarity. Pinacocytes are filled with mesohyl which is a gel like substance that helps maintain the shape and structure of the sponge.
Why are gemmules likely to occur in sponges in areas with harsh winters?
Why are gemmules likely to occur in sponges in areas with harsh winters? They can survive periods of drought and freezing and more than three months without oxygen. Once favorable conditions return, they can escape and develop.
How are gemmules released?
… cold or drought by forming gemmules within the body of the adult sponge. These structures, which are surrounded by a resistant covering, are released when the sponge dies and disintegrates. When conditions are appropriate, the cell mass escapes from the covering and forms a new sponge.
How does a sponge reproduce?
Sponges reproduce both asexually and sexually. Asexual reproduction occurs by budding. Sponges may also reproduce asexually. Sperm are released into the surrounding water through the osculum.
How do sponges produce sperm?
Sponges may also reproduce asexually. Gametes develop from the differentiation of either choanocytes or amoebocytes, depending on the species. The sperm are then delivered to the eggs by the amoebocytes. Eggs are stored within the mesohyl, and that is where fertilization takes place to form a zygote.
What are gemmules and conidia?
Gemmule – asexual reproductive structure in sponges. Conidia – asexual reproductive structure in Penicillium. Related Answer.
What is meant by Gemmules?
Gemmules are internal buds found in sponges and are involved in asexual reproduction. It is an asexually reproduced mass of cells, that is capable of developing into a new organism i.e., an adult sponge.
What do Archaeocytes do in sponges?
Archaeocytes (or amoebocytes) have many functions; they are totipotent cells that can transform into sclerocytes, spongocytes, or collencytes. They also have a role in nutrient transport and sexual reproduction.
How do gemmules help sponges?
The Role of Gemmule in Sponge Reproduction The internal buds, gemmules are resistant to dehydration, freezing and can survive even without an oxygen supply.