BIOL 2004 Study Guide - Midterm Guide: Chlorophyll, Antheridium, Cytokinesis
25 Feb 2016
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Evolved from green algae: 450 mya (ordovician) Common in moist areas: require water for reproduction. 4 bya: atmospheric oxygen very low, co2 high. Now: atmosphere 78% n2, 21% o2, ~1% co2. Important in ecology: plant succession: progression of plants from bare land to forest. Bryophytes are pioneers first plants to colonize rock surface. Have rhizoids that dissolve rocky substances with acidic excretions to create a surface more plants can grow in: important members of epiphyte communities. Epiphytes: plants that grow harmlessly on other plants: serve as food for herbivores. Interesting findings: bryophytes can withstand increased temperatures. Good for global warming: migratory birds carry mosses and spores in their feathers. Allows movement across great distances north to south. Pigment phytochrome is present: important in development: seed germination, seed dormancy, flowering, present in small concentrations. Chloroplasts contain chlorophyll a, b, and carotenoids: carotenoids present after chlorophyll has been degraded.
