Biology 2601A/B Lecture Notes - Lecture 14: Model Organism, Guttation, Trimethylglycine

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Lecture 14 - water and nutrient absorption 1: root structure and function. I(cid:374) the (cid:454)(cid:455)le(cid:373) (cid:449)ater is (cid:373)o(cid:448)i(cid:374)g alo(cid:374)g a (cid:449)ater pressure gradie(cid:374)t (cid:894) p(cid:895) Figure shows a cross section of the root: water is pulled from soil into roots and up to leaves (through a concentration gradient, water is pulled up towards the site of evaporation. Stomata: at the leaf"s surface you have the stomata. If you open the stomata, this allows for: co2 in, water out. How does water get into the plant: happens through the root system. Structure of the very tip of the root: bottom - root cap, protects the rest of the root. Fairly delicate, small living cells: mucigel sheath. So it(cid:859)s the gro(cid:449)th that(cid:859)s o(cid:272)(cid:272)urri(cid:374)g i(cid:374) the elo(cid:374)gatio(cid:374) zo(cid:374)e that is pushi(cid:374)g the roots downwards: epidermis, outer layer of cells that are a little tougher, endodermis, has a casparian strip, cortex.

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