BIOL 117 Lecture 10: Chapter 10 - Plantae
23 Jul 2016
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Kingdom: plantae ~ land, aquatic plants, and green algae. Diversity and commonalities: duckweed: smallest owering plant, oat on water, ducks move pond to pond, giant sequoia: one of the largest trees, chlorophyll a and b, beta-carotene; green bec doesn"t absorb green part of spectrum. Elongated cells to allow growth in deeper water: or grow more cells, inef cient because takes more time to transfer energy. Wednesday, october 14, 2015: some single cells grow up to 25 meters. Cellulose surrounding membranes: adds rigidity which allows growth upright and above water surface. Bene ts of moving to land: no competition, sunlight, co2, no heterotrophs (nobody there to consume plants) Challenges of moving to land: dehydration/transport of water, reproduction ( agellated sperm traveled through water, needed more cellulose, transport of photosynthate sugars. New terrestrial plants needed storage for glucose, roots in aquatic plants were used for anchoring, not nutrient storage: uv radiation.
