An asexually produced mass of cells, which are capable of developing into a new organism or into an adult freshwater sponge is termed as a Gemmule. They are small bud-like cells, which are formed by sponges to withstand unfavourable environmental conditions.
How are gemmules formed in sponges?
Asexual reproduction in sponges occurs via budding, either by external or internal buds. The internal buds are called gemmules. Only endogenous types of buds develop into new sponges.
How do gemmules help sponges?
reproductive function
These so-called “gemmules” are expelled from the adult sponge and, in some marine species, serve as a normal reproductive process or, sometimes, as a means to carry the sponges over periods of unfavourable conditions when the adults degenerate; e.g., drought, temperature extremes.
Why would a sponge form gemmules?
As part of their life cycle, many sponges produce gemmules as a means of surviving environmental challenge. In most sponges, the gemmules contain cells that are initially in a state of metabolic arrest that is controlled by endogenous factors. This state is known as diapause.
What are gemmules and conidia?
Gemmule – asexual reproductive structure in sponges. Conidia – asexual reproductive structure in Penicillium. Related Answer.
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.
What are gemmules give their functions?
Gemmules are internal buds found in sponges and are involved in asexual reproduction. e.g. Spongilla . These are formed during unfavourable conditions and help in perennation and dispersal.
Where are Archaeocytes found?
Archaeocytes (from Greek archaios “beginning” and kytos “hollow vessel”) or amoebocytes are amoeboid cells found in sponges. They are totipotent and have varied functions depending on the species.
Which phylum has characteristics of gemmules?
Gemmules formation is the characteristic feature of water sponges . In sponges , reproduction is of asexual type mainly by gemmules or budding or reduction bodies or fission.
Do sponges reproduce by gemmules?
Sponges that reproduce asexually produce buds or, more often, gemmules, which are packets of several cells of various types inside a protective covering. Fresh water sponges of the Spongillidae often produce gemmules prior to winter. These then develop into adult sponges beginning the following spring.
Are gemmules spores?
Gemmules are the specialized asexual spores formed in sponges.
Why are spicules important for sponges?
Besides supporting sponge cells, spicules can help larvae stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey. Conversely, the role of spicules and skeletons in deterring predation has not been demonstrated.
Are gemmules only found in freshwater sponges?
Sponges reproduce by sexual and asexual methods, which include fragmentation or budding; the production of gemmules is another asexual reproduction method, but is found only in freshwater sponges.
What are Gemmules name an organism in which these are formed?
Textbook solution
Gemmules are the internal buds which consist of a small group of cells that are enclosed by a protective coating. These are formed within the body of freshwater sponges and few marine sponges. Example- Spongilla.
Where is conidia found?
Conidia are asexual spores produced in fungi. They are produced externally at the tip or side of the hyphae or on special structures called conidiophores.
