Bio 101 Plant Anatomy Ex 2 5 Postlab
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Bio 101 Plant Anatomy Ex 2 5 Postlab
- 1. Bio 101 Plant AnatomyEx. 2-5 Post lab discussion
- 2. Meristems Based on location Apical meristem Lateral Meristem Based on origin Primary meristems Secondary meristems
- 3. Root apex vs. Shoot apex Root apex –bidirectional (root cap and towards the axis) SUBTERMINAL No lateral appendages No nodes and internodes Branching initiated beyond the region of most active growth
- 4. Fundamental Tissues Parenchyma Collenchyma Sclerenchyma
- 5. Parenchyma P-walls only; except for parenchyma found in secondary xylem Living Intercellular spaces
- 7. Collenchyma Angular Lamellar Lacunar
- 8. Sclerenchyma Differentiate: Sclereids Fibers FIBERS: a. Xylaryfibers— 1. libriform(absent in gymno) 2. fiber-tracheid b. Extraxylaryfibers– location?
- 10. Extra xylary fibers Monocot: bundle sheath Climbing dicots: cortical layer; pericyclic fibers
- 12. Sclereids brachysclereids– phloem, cortex and bark of stems ---flesh of fruits of pear Macrosclereids– testa of seeds of legumes Osteosclereids– seeds and leaves of dicots Astrosclereids--leaves
- 13. Parenchyma Origins Ground meristem Procambium Phellogen Vascular cambium
- 14. Collenchyma origins Ground meristem Procambium
- 15. Sclerenchyma origins Sclereid Parenchyma (sclerosis)—protoderm, procambium, or cambium, ground merisetm Fiber Procambium Cambium Ground meristem
- 16. Conducting Tissues XYLEM Vessels Tracheids Fibers (libriform and fiber-tracheid) Parenchyma– ray parenchyma and axial parenchyma PHLOEM Sieve tube or sieve cells Companion cells or albuminous cells Fibers (bast fibers) parenchyma
- 17. Vessel orTracheid? Imperforated Tapering ends Short and drum-like Arranged end to end Overlapping
- 18. Perforation (vessels) Simple Multiple Scalariform Reticulate foraminate
- 19. Secondary wall pattern Tracheids and vessel elements Protoxylem – annular or helical Metaxylem– scalariform; reticulate; pitted
- 22. Phloem Sieve tube elements -- arranged end to end -- enucleate -- with specialized depressions at their end wall (sieve areas) ---sieve plates (end wall)
- 23. Sieve plate Simple Compound
- 25. Origins, Topography Vessel Tracheid Sieve tube Companion cell Sieve cell
- 26. Advantages Helical or annular tracheids?