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Ex 6 10 post lab bio 101 lab


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Ex 6 10 post lab bio 101 lab

  1. 1. Bio 101 LAB Bio 101 LABPost lab Discussion Ex. 6 10 Ex. 6‐10
  2. 2. Exercise 6 Exercise 6Epidermis‐ Outermost layer of tissues‐ Cl l Closely attached; devoid of intercellular  h d d id f i ll l spacesMULTIPLE EPIDERMIS—O: protoderm pHYPODERMIS– O: ground meristem
  3. 3. Epidermis• Ordinary epidermal Ordinary epidermal  cells – devoid of  intercellular spaces• Cells with special  structure, form or  content• Cells connected with  stomata• Appendages
  4. 4. Stomatal ComplexesEudicot Monocot• Anomocytic • Type I• Anisocytic • Type II• Paracytic • Type III Type III• Diacytic • Type IV• Actinocytic
  5. 5. MONOCOT STOMATA TYPE IV= anomocyticType III Type I Type I Type I Type II
  6. 6. Exercise 9  Exercise 9Primary tissues a y t ssues‐ Products of primary meristemsOBSERVE THE TISSUE ORGANIZATION OF STEMS IN  PRIMARY GROWTHDermal tissue system yGround tissue systemPith regionVascular systemVascular system
  7. 7. Exercise 10 Exercise 10• Secondary tissues Secondary tissues‐ Tissues dervied from vascular cambium and  cork cambium cork cambiumVascular cambium• Secondary xylem and secondary phloem  (fusiform initials)• Vascular rays (ray initials) 
  8. 8. • Cork cambium / phellogen Cork cambium / phellogen‐ Cork cells /phellem and secondary cortex/  phellodermSECONDARY VASCULAR TISSUESa. Axial system yb. Radial system
  9. 9. • Conifer rays  y (gymnosperms)‐ One cell wide  (uniseriate) except with  ( ) h resin ductsa. Ray tracheidsa Ray tracheidsb. Ray parenchymaHOMOCELLULAR or  HETEROCELLULAR
  10. 10. • Angiosperm rays‐ 1 to many cell wide‐ One type of cell: ray  parenchyma but varies in shape a. procumbent b. uprightHOMO or HETERO
  11. 11. • Name all the secondary tissues and identify: Name all the secondary tissues and identify:‐Location, function, origin• CCorrection: cork cambium being unidirectional i k bi b i idi i l• Bark=  consists of a. Inner bark  living; secondary phloema Inner bark – living; secondary phloemb. outer bark (rhytidome)‐ dead
  12. 12. Ex. 7 Laticifers Ex. 7 Laticifers• Cells or Series of cells containing fluid (latex) Cells or Series of cells containing fluid (latex)A. Simple/ non articulated‐ single cellB. C Compound/ articulated‐ series of cell d/ i l d i f llLatex
  13. 13. Articulated laticifer Articulated laticifer• Non anastomosing Non anastomosing‐ Long, cell chains or compound tubes not  connected with each other laterally connected with each other laterally• Anastomosing‐ Form lateral anastomoses (network) with  similar chains or tubes forming a reticulum
  14. 14. Non articulated laticifer Non articulated laticifer• Unbranched• Branched h d‐
  15. 15. Latex• Clear (Nerium oleander, Araceae) C ea ( e u o ea de , aceae)• Milky (Euphorbia, Ficus)• Contents: CHO, organic acids, salts, sterols, fats Contents: CHO, organic acids, salts, sterols, fats  and mucilages• Terpenoids (rubber), cardiac glycosides,  alkaloids  p ( ), gy , (morphine, codeine), sugar, protein• Starch grains(Euphorbiaceae, Apocynaceae)• Crystals• Enzymes (papain, cellulase, pectinase etc)
  16. 16. Function of laticifers Function of laticifers• Food conduction? Food conduction?• Food storage?• Rubber– a metabolic overspill bb b li ill• Sequester toxic secondary metabolites— protection against herbivores