What are trends of the gametophyte in the evolution of plant, Biology

Assignment Help:

What are trends of the gametophyte in the evolution of plants?

The tendency of the gametophyte evolution in plants has been towards the formation of gametes that are self-determining from water. In the bryophytes and in the pteridophytes the fecundation is totally dependent on water. In the phanerogamic plants such dependency doesn't exist.

An additional tendency is the reduction in the size and duration of the gametophyte.

In the bryophytes gametophyte is indeed the lasting stage. In gymnosperms, pteridophytes and angiosperms it became the temporary stage and its relative size was successively reduced.

A third evolutionary trend that is relates to the interdependency between gametophytes and sporophytes. In the bryophytes the sporophyte is completely dependent on the gametophyte to survive. In remaining plants the sporophyte is the independent stage and the once autotrophic gametophyte in the bryophytes and the pteridophytes became dependent upon the sporophyte in the phanerogamic plants.

 


Related Discussions:- What are trends of the gametophyte in the evolution of plant

Which kind of polarity do water-soluble have, Which kind of polarity do wat...

Which kind of polarity do water-soluble and fat-soluble substances respectively have? Water-soluble substances are polar molecules, i.e., they have electrically charged areas.

Goal of fostering the integration of biology, Evaluate how best to achieve ...

Evaluate how best to achieve the goal of fostering the integration of biology, statistics, and mathematics. What impediments stand in the way of progress? What is the best way to

Systemic diseases in animals, S y s te m i c Diseases Diseases o...

S y s te m i c Diseases Diseases of the gastrointestinal tract The diseases of gastrointestinal system are manifested by abnormality in prehension, mastication and s

Production of healthcare - contestability and measurability, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Female gametophyte formed in angiosperms, Q. How is female gametophyte form...

Q. How is female gametophyte formed in angiosperms? Into the flower ovary there are megasporangia enclosed by a tegument having a small opening, the micropyle. Inside the megas

Explain the probiotics in foods, Explain the Probiotics in Foods? Yoghu...

Explain the Probiotics in Foods? Yoghurts have been supplemented with probiotic strains of bifidobacteria and Lactobacilli. Milks fermented solely by intestinal isolates of lac

Explain anticonvulsants and cerebral palsy, Anticonvulsants and Cerebral Pa...

Anticonvulsants and Cerebral Palsy Anticonvulsants : drugs that prevent reduce or stop convulsions or seizures. Cerebral Palsy: A group of chronic foundations affecting

Equine herpes virus infections , Equine herpes virus infections (equine rhi...

Equine herpes virus infections (equine rhinopneumonitis, abortions) Equine herpes virus infections in horses and foal are caused by Alphaherpes virus of herpesviridae family p

Golgi apparatus, GOLGI APPARATUS Camillo Golgi in 1898 discovered a retic...

GOLGI APPARATUS Camillo Golgi in 1898 discovered a reticular structure in the cytoplasm of nerve cells with the help of metal impregnation technique using silver nitrate for whic

Determine the term - techniques visualise anatomy, Determine the term - tec...

Determine the term - techniques visualise anatomy Some techniques visualise anatomy, provide objective confirmation of structural abnormality. These include neuroradiological i

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