BIO 191 Lecture Notes - Lecture 99: Vascular Cambium, Xylem, Seed Dormancy
5 Oct 2016
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Document Summary
Plants are photosynthetic and terrestrial: co2, more light, minerals/nutrients. Specific type of green algae may have been the ancestor: yet algae are mostly aquatic, they can adapt to life out in air. Shared characteristics between plants and some algae (including charophyceans: multicellular, eukaryotic, photosynthetic, cellulose cell walls, chlorophyll a and b in chloroplasts. Between plant and charophyceans: rings of cellulose-synthesizing enzymes, structure of flagellated sperm (not all plants, cell plate formation, dna sequence information. Derived characteristics of plants: cuticle retains water, stomata pores that open to allow photosynthesis to occur, leaking water, multicellular gametangia (archeogonia and antheridia) Archeogonia-multicellular structure that produces and protects the egg from drying out. Antheridia-multicellular structure that produces and protects the sperm from drying out: protected embryo (embryophytes=embryo of the plant) Mostly the archeogonia-produces and protects the egg as well as the early embryo: sporangia produces and protects the spores, spores. Produced by sporangia and resistant to drying out.
