Some cells instead of being platelet cells, become single cell thick root hairs. The zone where the root takes up nutrients are limited to root hairs

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1 Plant Cells and Plant Tissues II Slide One epidermis (rt / shts / leaves) Slide Tw variatin n a theme Slide Three epidermal hairs (rt) Nutrient and water uptake Sme cells instead f being platelet cells, becme single cell thick rt hairs The zne where the rt takes up nutrients are limited t rt hairs Slide Fur epidermal glands Glands are the heads filled with liquid n a stalk Glands are the rgan that prduces THC (in hemp cannabis sativa) Slide Five stinging hairs act as prtectin against herbivres Stinging nettle made f silica nettles and injects chemicals inside skin f animal attacking it Slide Six cnical epidermis Act as a surce f attractin Cnical epidermis creates a velvety sheen Slide Seven epidermal platelets Prtectin against the sun (t much light) Silverberry grws in the pen and suffers water shrtage it grws its epidermis int large platelets that prtect the epidermis underneath frm water lss Slide Eight h2 repellent epidermis ltus needs a water repellent surface t ensure effect gas exchange grwing tiny cne shaped structures that cause water t aggregate and fall ff the ltus Slide Nine epidermal sensing hairs

2 venus fly trap Slide Ten epidermis f the pitcher plant pitcher plant lacks in nitrgen mdified leaf filled with water mixed with digestive juices any insects that fall in are digested fr nitrgen cntent trichmes n the utside n the leaf t facilitate ladder-like functin fr insects inside f leaf is smth and insects slide int the digestive juices Slide Eleven bring Slide Twelve periderm (prtectin / exchange) Slide Thirteen perennial plants grwing tw r mre years as ppsed t annual plants grwing ne year wear and tear f epidermis grwth f stem -> ripping apart f epidermis periderm is used fr the sealing and maintenance f epidermis Slide Furteen wf periderm = bark tw cell types making up the periderm is the crk cambium (surce f new periderm) secndary meristem crk cells (prtectin / actual bark) dead at maturity / walls f lignin (anti-micrbial) / and suberin (wax-like / against dessicatin) Slide Fifteen periderm frmatin crk cambium n the inside f the epidermis slwly frms crk cells epidermis finally rips apart, but the cell is all gd thanks t crk cells

3 Slide Sixteen xylem transprt / supprt / strage Slide Seventeen xylem tracheids (transprt / supprt) dead at maturity vessels (transprt / supprt) dead at maturity parenchyma (strage) fibers (supprt) Slide Eighteen tracheids vs vessel members tracheids strngly tapered cells have tiny pres where water runs thrugh (pith) vessel members are evlutinarily mre sphisticated water runs nt nly thrugh piths, but als perfratins water can nt nly run vertically, but als hrizntally Slide Nineteen tracheids thick lignified cell walls h2 flws thrugh adjacent piths frm cell t cell Slide Twenty vessels thick lignified cell walls (variably enfrced) h2 flws thrugh penings (perfratins) and piths frm cell t cell Slide Twenty-One xylem crss sectin tracheids in cnifers alne are relatively weaker alne than tracheids / vessel members / fibers tgether in angisperms distinguished by sftwd (cnifers) and hardwd (angisperms) Slide Twenty-Tw xylem supprt

4 tracheids / vessels / fibers are mre r less lignified resulting in hard and sturdy structures Slide Twenty-Three phlem (transprt) Slide Twenty-Fur phlem sieve tube members (transprt) cntinuus system transprting disslved fd material (primarily sugars) frm leaves t rest f plants cmpanin cells (supprt) brain f the sieve tube members Slide Twenty-Five phlem Living cells Sugar flws thrugh sieve tube members divided by sieve plates Cmpanin cells: cntrl bth themselves and sieve tube members Sieve tube members lack nucleus and s are cntrlled by cmpanin cells Slide Twenty-Six vascular system xylem + phlem Slide Twenty-Seven vascular tissue (nn wdy plants) Vascular bundle is made up f phlem and xylem Enfrcing the vascular bundle is a cllenchyma cap abve it Slide Twenty-Eight vascular tissue (trees) Mst f a tree is made up f xylem Outside layers are cmprised f the phlem and periderm (bark) Slide Twenty-Nine grund tissue (supprt / strage) Essentially what is nt (xylem / phlem / epidermis / periderm) is grund tissue Tissues ther than dermal and vascular tissue Slide Thirty grund tissue (nn-wdy plants)

5 Majrity f grund tissue is made up f parenchyma > cllenchymas > sclerenchyma Phtsynthesis (when it is clse t the surface f plant) / stre nutrients / fill space Slide Thirty-One characteristics f plant tissues Dermal tissue Epidermis / Periderm Flat living parenchyma in nn-wdy plants Flat dead parenchyma (crk) in wdy plants Functin in rts: water and nutrient absrptin / prtectin Functin in stems: gas exchange / prtectin Functin in leaves: gas exchange / prtectin Vascular tissue Xylem / Phlem Dead xylem cells (water / minerals) Living phlem cells (sugar / phtsynthetic prducts) Interspersed parenchyma and sclerenchyma Functin in rts / stems / leaves: transprt / supprt Grund tissue Mstly Parenchyma Usually with sme cllenchymas and fewer sclerchyma Functin in rts / stems: supprt / strage Functin in leaves: phtsynthesis

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