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Plant org lab tz

Plant org lab tz

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Plant org lab tz

  1. 1. Plant Tissue Systems  Ground tissue system • Photosynthesis, storage, and structural support of other tissues  Vascular tissue system • Distributes absorbed water and mineral ions and products of photosynthesis  Dermal tissue system • Covers and protects exposed plant surfaces
  2. 2. Body Plan: Tomato Plant •Shoot system: above ground •Stems, leaves, flowers •Root system: below ground
  3. 3. Apical and Lateral Meristems •Apical meristem: located at tips of shoots and roots •Primary growth •Lengthening •Lots of mitosis •Lateral meristem: secondary growth •Thickening
  4. 4. Vascular Tissues •Xylem: transports water •Two cell types: tracheids and vessel elements •Hollow, nonliving •Phloem: transports sugars •Cells called sieve tubes •Living
  5. 5. Dermal Tissues  Epidermis • Usually a single outer layer of cells that secrete a waxy, protective cuticle • May contain specialized cells that form stomata for gas exchange
  6. 6. Eudicots and Monocots  Flowering plants are divided into two classes with tissues organized into different patterns  Eudicots have two cotyledons (seed leaves) • Netlike leaf veins • Floral parts in multiples of 4 and 5  Monocots have one cotyledon • Parallel leaf veins • Floral parts in multiples of 3
  7. 7. Inside the Stem  Vascular bundles • Multistranded cords of vascular tissues threaded lengthwise through ground tissues of all shoots  Two distinct patterns of vascular bundles • Eudicot stems: Cylinders run parallel with stem, divide ground tissue into cortex and pith • Monocot stems: Bundles distributed throughout ground tissue
  8. 8. Root Structures  Divided into four general regions • Root Cap: protects root as it lengthens • Region of Cell Division: apical meristem • Region of Elongation: cells lengthen and widen • Region of Maturation: mature cells differentiate into different types •Root hairs: increase the surface area for water and nutrient uptake •Derived from epidermis
  9. 9. Internal Root Structures  Epidermis: covers exposed surfaces  Cortex: cells adjacent to the epidermis • Used for food storage  Vascular tissues: xylem and phloem • Form the vascular cylinder  Endodermis: single cell layer around the vascular tissues • Aids in mineral/water exchange  Pericycle: undifferentiated cells • Source of new lateral roots
  10. 10. Eudicot and Monocot Root Structures You will look at cross section slides of a monocot and a eudicot root. Notice the star shape xylem and phloem in between the points on the eudicot Look for the pith in the monocot, used for food storage.
  11. 11. Root Systems Taproot Fibrous root
  12. 12. Modified Stems  Many plants have modified stem structures that function in storage or reproduction • Stolons (reproductive runners) • Rhizomes (main underground storage stems) • Bulbs (layered underground stems) • Corms (solid underground storage stems) • Tubers (stolons thickened for storage)
  13. 13. Leaf Shapes •Simple leaf: single blade •Compound leaf: blade with leaflets •Palmately: leaflets attached at one point •Pinnately: leaflets attached at intervals
  14. 14. Leaf Structure •Epidermis: outermost layer of cells •Lower and upper •Cuticle: waxy, protect, conserve H2O •Palisade mesophyll: upper, many chloroplasts •Spongy mesophyll: lower, air spaces •Stomata: openings for gas exchange •Guard cells: surround stomata and control
  15. 15. Vein Patterns in Flowering Plants

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  • MohammadMujadidi

    Dec. 23, 2016
  • nitinsarkar6

    Jan. 5, 2019
  • RifatSagor

    May. 13, 2019

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