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Function shapes structure… Structure enables function

Function shapes structure… Structure enables function What functions and structures exist? Those passed on by past generations… Evolution. CB 35.2. Plants grow and reproduce, as well as, respond to the environment. Plants grow and reproduce, respond to the environment… today- transport.

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Function shapes structure… Structure enables function

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  1. Function shapes structure…Structure enables function What functions and structures exist? Those passed on by past generations… Evolution

  2. CB 35.2 Plants grow and reproduce, as well as, respond to the environment.

  3. Plants grow and reproduce, respond to the environment… today- transport

  4. CB 35.9 Types of Plant Cells: defined by function and cell wall

  5. CB 6.9

  6. Parenchyma cells- most common cells; primary cell walls CB 35.9 60 m

  7. Parenchyma in a stem CB 35.16

  8. Collenchyma cells- unevenly thickened cell walls; flexible support CB35.9 80 m

  9. Collenchyma in a leaf

  10. Sclerenchyma cells- Thickened secondary walls (inside primary wall); with lignin; rigid 5 m 25 m CB 35.9

  11. 100 m Water conducting cells of Xylem: vesselsandtracheids(types of sclerenchyma) CB 35.9

  12. Sugar conducting cells of Phloem: sieve-tubes and companion cells CB 35.9 30 m 15 m

  13. CB 35.18 Plants transport water, sugar, minerals, hormones, etc through the vascular system comprised of xylem and phloem

  14. CB 36.2 Water travels from ground out through stomata via xylem

  15. CB 36.2 The exit of water through stomata is accompanied by gas exchange

  16. CB 36.2 Sunlight powers photosynthesis and these sugars are transported via phloem

  17. The direction of Phloem transport is versatile.

  18. Plant cell to cell transport can occur by two pathways: symp[lastic and apoplastic CB 36.8 plasmodesmata

  19. Sugar is loaded at sources and unloaded at sinks CB 36.17

  20. CB 36.18 source:leaf Sugar is loaded at sources and unloaded at sinks sink:root, flower, emerging leaf etc…

  21. CB 35.18 Plants transport water, sugar, minerals, hormones…

  22. CB 36.7 Much of plant support comes from turgor pressure.

  23. CB 36.13 Water moves from the ground through roots into the shoot and out stomata in the leaves.

  24. CB 35.12 and .13 In roots the vascular bundle is in the center

  25. CB 36.9 The casparian strip of the endodermis keeps water from entering the xylem via a purely apoplastic route.

  26. CB 36.13 What moves the water through the xylem?

  27. CB 35.17

  28. Stomata control entry of CO2 and exit of H2O from plant leaves CB 36.12 Stomata

  29. Stomata on the underside of a leaf

  30. CB 36.15 Guard cell opening is regulated by turgor

  31. CB 36.13 What moves the water through the xylem?Transpiration, Adhesion, Cohesion, andTension

  32. water transport limits plant growth

  33. More xylem is needed for more water transport: secondary growth phloem xylem

  34. Xylem is tough, and full of lignin- inhibits the ability to use plants to produce biofuels phloem xylem

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