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Anatomy Review

Anatomy Review. BIO 201 - Botany. Herbaceous stems. Have separate vascular bundles In each bundle: - Xylem toward center - Phloem toward outside Bundle arrangement important - monocots randomly scattered - dicots in r ing. Corn stem – a monocot. Corn with detail of bundles (monkey faces).

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Anatomy Review

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  1. Anatomy Review BIO 201 - Botany

  2. Herbaceous stems • Have separate vascular bundles • In each bundle:- Xylem toward center- Phloem toward outside • Bundle arrangement important- monocots randomly scattered- dicots in ring

  3. Corn stem – a monocot

  4. Corn with detail of bundles(monkey faces)

  5. Bundle details • Xylem • Phloem • Sclerenchyma • Cortex

  6. Alfalfa stem – a dicot

  7. Sunflower stem – semi-woody(development of a cambium)

  8. TYPICAL TREE TRUNK ANATOMY • Wood – central largest portion • Cambium – thin area of small dividing cells • Bark – outer layer

  9. TYPICAL TREE TRUNK ANATOMY • Bark to outside • Cambium thin!(dark line) • Xylem to inside(annual rings visible) • Pith in center 

  10. TREE ANATOMY • 2o phloem • Cambium • 2o xylem • 1o xylem • Growth ring • Vascular ray • Pith

  11. Scanning electron micrograph (x60) of the wood of an angiosperm tree, the beech Fagus sylvatica, showing the 'drinking straw' vessels packed in between the narrower tracheids, and oriented parallel to the long axis of the trunk. Conifers have only tracheids. (Image: Brian Butterfield and Brian Meylan) CONTRASTING SECTION TYPES • Cross • Radial • Tangential

  12. PINE CROSS SECTION • Tracheid cells circular • Can see annual rings (cell sizes slowly change) • Vascular rays elongate, but not well developed • Resin canals visible

  13. CROSS SECTION

  14. PINE RADIAL SECTION • Tracheid cells elongate • Can see annual rings (cell sizes slowly change) • Vascular rays of elongate cells, but area squared • Resin canals visible

  15. PINE RADIAL SECTION

  16. PINE TANGENTIAL SECTION • Tracheid cells elongate, pits visible • Cannot see annual rings • Vascular rays elongate with circular cells within • Resin canals visible

  17. PINE SECTION COMPARISON

  18. Softwood vs hardwood • Resin canals • Uniformity of xylem

  19. Root anatomy All roots have • Endodermis • One vascular bundle at center

  20. Monocot vs dicot roots Corn (monocot) buttercup (dicot)

  21. Root anatomy - details • Epidermis • Cortex • Endodermis • Pericycle • Vascular tissue

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