BIOL-1507EL Study Guide - Comprehensive Final Exam Guide - Zygote, Xylem, Xerophyte
20 Nov 2018
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Biol-1507el: plant diversity and colonization of land. When moved to land, started to create pollen. The haploid alga spends most of its life producing and releasing gametes into the surrounding water. The single zygote is the only diploid stage. Photoautotrophs definition- organisms that use light as their energy source and carbon dioxide as their carbon source. Plant cells have walls that are made up of cellulose. All plants are sessile or stationary (not able to move around) and no terrestrial animals are sessile. Plants have an alternation of generations life cycle. Two multicellular stages in the life cycle. Gametophyte the haploid generation produces gametes by mitosis. The function is to nourish and protect the forthcoming sporophyte generation. The embryo is retained inside of the gametophyte tissue. Plants are nearly all terrestrial, although some plants have returned secondarily to water during their evolution. Zygote divides by meiosis to produce spores that gives rise to the haploid stage again.
