Plant Structure and Function

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Plant Structure and Function

  1. 1. FLOWERS
  2. 6. FLOWERING PLANTS = ANGIOSPERMS ANGIOSPERMS ANGIOSPERMS
  3. 7. Why do you think seeds are protected by a fruit?
  4. 8. ANGIOSPERMS are divided into two major classes: MONOCOTY LEDONS DICOT YLEDONS Have only ONE COTYLEDON Have TWO COTYLEDON
  5. 10. DID YOU KNOW THAT COFFEE BEANS ARE SEEDS TOO!?
  6. 12. ROOT
  7. 13. STEM
  8. 14. LEAF
  9. 15. FLOWER
  10. 17. THE ROOT
  11. 18. THERE ARE TWO TYPES OF ROOTS:
  12. 20. Mainly found in DICOTS. In this case, one has a single root growing vertically down into the soil from which lateral roots come out. TAP ROOTS
  13. 21. Found in MONOCOTS. In this case, several roots grow out at the same time, and laterals grow from them. FIBROUS ROOTS
  14. 22. THE ROOT
  15. 23. ABSORPTION OF WATER
  16. 25. XYLEM PHLOEM CORTEX ROOT HAIR EPIDERMIS
  17. 27. THE STEM
  18. 28. The STEM of a plant is that structure that is usually erect and found above the ground . It usually has leaves at regular intervals and a terminal bud at the growing point .
  19. 29. NODE LATERAL BUD
  20. 33. MONOCOT DICOT THERE ARE TWO TYPES OF STEMS:
  21. 34. Z ea mays IN MONOCOTS LIKE MAIZE THE VASCULAR BUNDLES ARE SCATTERED THROUGHOUT THE STEM TRANSVERSE SECTION THROUGH A YOUNG MAIZE STEM
  22. 36. 1 EPIDERMIS3 SCLERENCHYMA CAP4 PHLOEM5 XYLEM2 CORTEX6 PITH CROSS-SECTION THROUGH A dicot STEM sunflower
  23. 37. THE INTERNAL STRUCTURE OF THE STEM
  24. 38. THE INTERNAL STRUCTURE OF THE STEM EPIDERMIS VASCULAR BUNDLE CORTEX AND PITH CAMBIUM
  25. 39. PLANT EPIDERMIS EPIDERMIS WAXY CUTICLE
  26. 40. THE VASCULAR BUNDLES
  27. 41. THE VASCULAR BUNDLES
  28. 42. xylem Carries water and minerals up to the stem. Water is done by OSMOSIS whilst Minerals by ACTIVE TRANSPORT The XYLEM transports only in one direction ... which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY which way? UP or DOWN? WHY
  29. 43. phloem Carries sugars produced by the process of ___________ Q: Do the roots need Sugar (food) ? For what? Q: Do flowers need Sugar? Q: So in what direction is sugar translocated (transported) inside the Phloem?
  30. 44. CORTEX CORTEX is layer is the food storage system of the root, called packing tissue . It is also found in the stem.
  31. 45. CORTEX
  32. 46. PITH PITCH is the CENTRAL tissue of the stem These tissues serve also as supporting tissue and contribute to the stem’s rigidity.
  33. 47. CAMBIUM CAMBIUM is a thin layer of cells, which separates the xylem from the phloem . These cells can divide, thus increasing its diameter of the stem, known as Secondary thickening. XYLEM PHLOEM

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