BIOL 2000 Lecture Notes - Lecture 3: C3 Carbon Fixation, Leaf, Vascular Bundle
Document Summary
Some adaptations of plants for life on land. Osmotic adaptations of fish for marine life. Plants evolved root, vascular systems and stomates to obtain water and nutrients, and pump them through their bodies: microorganisms live in water and depend on diffusion to feed and cleanse their cell- limited to a few m. Plants pump water and transport nutrients through their vascular system. Evaporation at the leaf sucks water up through the plant. Tension pulls water into the leaf veins. And through the xylem vessels in the stem. Then through the root: osmosis and into the xylem. Controlled by: waxy leaf cuticle, stomates on the underside- regulate evaporation. Spines and hairs help dessert plants deal with heat and drought. Still boundary layer that traps moisture and reduces evaporation. Plants have difficulty trapping co2 without losing water (c3 mechanism) Most plants and algae employ the c3 mode of. Co2 uptake: stomates must remain open for hour- not water efficient.
