GLY 135 - Paleozoic Land Plants - GLY 135 Paleozoic Land...

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GLY 135 - Paleozoic Land Plants I. Intro: Plants – Photosynthesis Animals – mobility, nervous system Both – require nutrients, gas exchange, reproduction, circulatory system II. Colonization of land by plants (1 st plants = aquatic green algae) a. Advantages of life on land - Access to sunlight for photosynthesis - CO2 easier to extract - Dispersal of spores by the wind b. Problems to “solve” in moving onto land - Absorption of nutrients - Harsh environment (temperature, drying out) - Structural support - Reproduction c. Land plant structure “solves” these problems - Leaves = site of photosynthesis (mainly) – light + CO2 - Structural support w/ in stem - Roots absorb nutrients - Transport (circ. Sys) – xylem transports h2o, nutrients, phloem – transport food produced by plants - Waxy coating (cuticle) – protect from environment w/ pores (stomata for gas exchange) - Reproduction – cutinized spores in primitive land plants III. Fossil record of Paleozoic plants a. 1 st
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  • Spring '14
  • PatriciaKelley
  • land plants, Fern, Paleozoic Land Plants, c. Land plant, Ordovician land spores

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