Strobilation - types of asexual reproduction, Biology

Assignment Help:

Strobilation - Types of Asexual Reproduction

Strobilation is a type of asexual reproduction in which successive segments are separated off from the body one after other. It is well demonstrated in some jellyfishes (Scyphozoa) and in tapeworms. In the life-history of Aurelia, a scyphozoan, the planula larva develops into a hydra-like stage termed as hydra tuba or scyphistoma. From the stolon, the scyphistomae may generate new scyphistoma. After a certain period of life this scyphistoma undergoes transverse division producing buds of medusae. This provides it a kind of pattern of a pile of saucers arranged one above the other. In this pile, the youngest (smallest) saucer lies towards the base and the oldest and the largest one at the free end. This "pile of saucers" stage is called the strobila. The transverse discs or young medusae - buds separate one after other from the strobila, each resultant in a kind of larva (called ephyra) which gradually metamorphoses to turns the adult Aurelia. A situation somewhat identical to the above also occurs in the tapeworms. New segments (proglottides) are continuously demarcated off from the neck by a sort of transverse fission; here also, it is the oldest proglottid at the free end that breaks off and the process keeps on repeating.


Related Discussions:- Strobilation - types of asexual reproduction

What a diploid cell contains, A diploid cell contains: A.one half of a comp...

A diploid cell contains: A.one half of a complete set of chromosomes B.several complete sets of chromosomes C.the correct number of chromosomes D.two complete sets of chromosomes E

Define thin layer chromatography, Define Thin Layer Chromatography? Thi...

Define Thin Layer Chromatography? This is an improvement over paper chromatography and uses thin layers of slurried absorbents like silica gel, alumina, cellulose, Kieselguhr,

Phylum placozoa, Phylum Placozoa The phylum Placozoa contains a single...

Phylum Placozoa The phylum Placozoa contains a single species of a minute marine animal Trichoplax adharens composed of a dorsal and ventral epithelial layer enclosing loose m

Sterility in angiosperms, Sterility in Angiosperms Sterility in angios...

Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A

Zoonoses disease- colibacillosis, Colibacillosis Colibacillosis is caused ...

Colibacillosis Colibacillosis is caused by different strains of Escherichia coli. The disease mainly affects children and travelers. Organisms grow in gut and produce toxin. It ma

Sensitive/critical periods: windows of enhanced plasticity, There are speci...

There are specific sensitive/critical periods in development during which acquisition of certain skills is substantially easier than at other times. In the animal domain there are

Closed type of circulatory systems, Closed Type of Circulatory Systems ...

Closed Type of Circulatory Systems Some non-chordates, like cephalopods (octopuses, squids), earthworms, polychactes and all vertebrates have a closed circulation along with b

Male reproductive disorders-congenital impotentia genarandi, Congenital imp...

Congenital impotentia genarandi Some bulls which are otherwise normal and healthy produce semen containing spermatozoa with specific morphological abnormalities together with

Define oseltamivir, Oseltamivir (Tamiflu)   This oral neuraminidase i...

Oseltamivir (Tamiflu)   This oral neuraminidase inhibitor, started within 36 hours of symptom onset, can decrease the severity and duration of symptoms caused by either influ

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