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Bio Notes Feb 28.

Bio Notes Feb 28. - Kanav Markan Bio notes Today Plant...

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Kanav Markan Bio notes 2/28/11 Today- Plant evolution Challenges in Plant Kingdom- proposed relationship Bryophytes, seedless vascular plants, and seed plants(gymno and angio) All plants are multicellular and perform photosynthesis chaerophyceans are the closest living relatives that looked like their aquatic ancestors --------- Original aquatic plants- desiccation not a problem; thus no cuticle is needed( waxy cuticle for water protection) KNOW stomata, water transport system, and gametes do not need to be protected from desiccation skeleton had lignin infused cell walls - dispersal is an issue land plants did have to worry about protective packaging of some of these structures, etc --------- KNOW difficulties of overcoming land challenges, how plants colonized land, etc --------- Adaptations of terrestrial plants: desiccation part important; Bryophytes- we must carefully differentiate these from mosses Gametophyte is DOMINANT generation of bryophytes Sporophyte is less often visible- sporophyteis diploid(2n); sits atop gametophyte, is dependent on the gametophyte; gametophyte is the haploid generation(1n) while sporophyte is diploid Some bryophytes do have pores; some mosses have stomates Some of the mosses do have water conducting tubes- water is really transported all through the tissue ---------- Mosses- analogy of fungus; be carful when distinguishing b/w mosses and lichens
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most mosses can be called Epiphytes- grow with a lot of shade and moisture- are good at soaking moisture out of the air up into their tissues ------ nonvascular plants- life cycle of a moss- alternation of generations- gametophyte and haploid generation- both generations are multicellular, one is diploid and other haploid ----- diversification of vascular plants seedless vascular plants grew along with seed plants the seedless could grow to 50 ft tall- (ie ferns)- in order to grow tall, they have lignin in their cell walls- remove selves from source of water using conducting vessels- this is the
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Bio Notes Feb 28. - Kanav Markan Bio notes Today Plant...

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