We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

Life Cycles of Bryophytes, Seedless Vascular Plants and Gymnosperms

The whole doc is available only for registered users

A limited time offer! Get a custom sample essay written according to your requirements urgent 3h delivery guaranteed

Order Now

1) Compare and contrast the life cycles of bryophytes, seedless vascular plants and gymnosperms. Focus your answer on traits (structures or processes) that affect the success of various transitions in the life cycle. How do any of the differences you mention affect the relative success of these different groups in dry environments? All bryophytes, for example, liverworts, mosses and hornworts, have the gametophyte generation as the most dominant. Antheridia and archegonia develop on the mature plant (the gametophyte). In the presence of water, the biflagellate sperm from the antheridia swim to the archegonia and fertilization occurs, leading to the production of a diploid sporophyte. The sporophyte grows up from the archegonium. Its body comprises a long stalk topped by a capsule within which spore-producing cells undergo meiosis to form haploid spores. In ferns and their allies, including clubmosses and horsetails, the conspicuous plant observed in the field is the diploid sporophyte.

The haploid spores develop in sori on the underside of the fronds and are dispersed by the wind (or in some cases, by floating on water). If conditions are right, a spore will germinate and grow into a rather inconspicuous plant body called a prothallus. Fern sperms then swim to the egg in the archegonium and produce a zygote. It develops into a new sporophyte. The life cycle of a typical gymnosperm include the dominant sporophyte. Gymnosperms usually have two different types of cones: male and female. The male cones have pollen grain, and the female cones have the ovules. The pollen gets to the female parts by the wind and forms zygote. Then eventually becomes a mature megastrobilus. . Water serves as a means to disperse spores away from the parent, sperm swim through the water to fertilize the female egg. All of these groups of plants have life cycles that involve alternation of generations.

Related Topics

We can write a custom essay

According to Your Specific Requirements

Order an essay
Materials Daily
100,000+ Subjects
2000+ Topics
Free Plagiarism
All Materials
are Cataloged Well

Sorry, but copying text is forbidden on this website. If you need this or any other sample, we can send it to you via email.

By clicking "SEND", you agree to our terms of service and privacy policy. We'll occasionally send you account related and promo emails.
Sorry, but only registered users have full access

How about getting this access

Your Answer Is Very Helpful For Us
Thank You A Lot!


Emma Taylor


Hi there!
Would you like to get such a paper?
How about getting a customized one?

Can't find What you were Looking for?

Get access to our huge, continuously updated knowledge base

The next update will be in:
14 : 59 : 59