Nonvascular Plants Reproduction

Summary:

The descendants of the first plants are still among us today, and they are the liverworts, hornworts, and mosses. The main thing about nonvascular plants is that they dont have specialized conductive tissue. They also have limited growth potential they don't have the wood to keep up the mass or the tissue to be big. 

They need water for reproduction.

Plants evolved a reproduction cycle where they take on 2 different forms of their lives called alternation of generations evolved first in algae.

In land plants, one generation called the gametophyte produces sexually by producing gametes and eggs and sperm (haploid). When sperm and egg fuse, rise of second generation called sporophyte generation which is asexual(diploid). The sporangium capsule produces haploid reproduction cells called spores.
Reproduction cycle needs water for sperm to move.

If spores lands on moist ground, it germinates and produces protonema that gives rise to buds which will grow to patch of moss which is a colony of haploid gametophytes which will mate and the generation alternations will continue.

Relevance to Class:

In class, our current unit is about the plants and we specifically learned about alternation of generations and vascular plants. This video is a crash course explaining the basic idea of vascular plants for further understanding. It mentions key vocab words like sporophyte, gametophyte...etc. that we need to learn.

Source:

Link: http://www.youtube.com/watch?v=iWaX97p6y9U

Creator: crashcourse

Uploaded: Oct. 1, 2012