Lecture 33 - Lecture 33 1 How to get from aquatic green algae to land plant a Regional specialization and transport to connect regions b Water

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Lecture 33 1) How to get from aquatic green algae to land plant? a) Regional specialization and transport to connect regions b) Water conservation and gas exchange c) Support on a terrestrial habitat d) Reproduction and dispersal 2) In water, the whole plant body has access to water and is evenly supported by the water. a) On land, resources are segregated (water is in the soil). Sunlight and air interact above the ground. Plant divided into underground roots and above ground stem and leaf. Root system is for uptake of water (some gas exchange), Shoot system is developed for photosynthesis and gas exchange. b) Need a way to move between roots and shoots – modifications for transport. Xylem allows water and minerals to move from roots to rest of plant, phloem allows sugars to move from leaves to rest of plant. c) On land, water conservation is now a big deal. To avoid losing water, plants have a wax layer ( cuticle ). They also have stomata , openings which allow for gas exchange (carbon dioxide goes in, water vapor and oxygen go out). Stoma have guard cells on either side with allow it to open and close the stoma, regulated by calcium ion influx/deflux. d)
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This note was uploaded on 02/09/2012 for the course BIOL 104 taught by Professor Smith during the Spring '09 term at Arkansas State.

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Lecture 33 - Lecture 33 1 How to get from aquatic green algae to land plant a Regional specialization and transport to connect regions b Water

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