Plant Structures

3,467 views

Published on

Plant parts

Published in: Education
3 Comments
6 Likes
Statistics
Notes
No Downloads
Views
Total views
3,467
On SlideShare
0
From Embeds
0
Number of Embeds
271
Actions
Shares
0
Downloads
0
Comments
3
Likes
6
Embeds 0
No embeds

No notes for slide

Plant Structures

  1. 1. Plant Structures By SJ Photography (http://search.creativecommons.org/#)
  2. 2. Three types of plant tissues <ul><li>Ground tissue – make up bulk of plant </li></ul><ul><li>Vascular tissue – distribute water and solutes (carbohydrates, nutrients) </li></ul><ul><li>Dermal tissue – cover and protect plant surface </li></ul>
  3. 3. Angiosperm body plan <ul><li>Aboveground: shoots </li></ul><ul><ul><li>Leaves, stems : produce </li></ul></ul><ul><ul><li>sugars by photosynthesis </li></ul></ul><ul><ul><li>Flowers : Reproduction </li></ul></ul><ul><li>Belowground: roots </li></ul><ul><ul><li>Absorb water and minerals </li></ul></ul><ul><ul><li>Store sugars/carbohydrates </li></ul></ul>SHOOT SYSTEM ROOT SYSTEM
  4. 4. Meristems <ul><li>Regions of cell division producing growth </li></ul><ul><li>Apical meristems </li></ul><ul><ul><li>Responsible for primary growth (lengthening) </li></ul></ul><ul><ul><li>At shoot and root tip </li></ul></ul><ul><li>Lateral meristems </li></ul><ul><ul><li>Responsible for secondary growth (thickening) </li></ul></ul>
  5. 5. Stem apical meristem
  6. 6. Root apical meristem
  7. 7. Lateral meristems
  8. 8. Aboveground: Stem and Leaf <ul><li>Major stem </li></ul><ul><ul><li>Secondary stems branch off </li></ul></ul><ul><li>Terminal bud : shoot tip </li></ul><ul><li>Auxiliary bud : location of secondary stem growth </li></ul><ul><li>Petiole : stalk attaching leaf to stem </li></ul><ul><li>Node : location on stem of leaf attachment </li></ul><ul><li>Internode : distance between two leaves on a stem </li></ul>
  9. 9. Leaf <ul><li>Blade: thin, flattened part </li></ul><ul><ul><li>Collects lights for photosynthesis </li></ul></ul><ul><ul><li>Exchanges gases </li></ul></ul>
  10. 10. Leaf Tissues <ul><li>Epidermis: Single layer of cells on top and bottom </li></ul><ul><ul><li>Secretes waxes onto the outer surface forming the cuticle </li></ul></ul>
  11. 11. Leaf Tissues <ul><li>Mesophyll: Photosynthetic tissue between the epidermis </li></ul><ul><ul><li>Palisade : attached to the upper epidermis </li></ul></ul><ul><ul><ul><li>Columnar shaped </li></ul></ul></ul><ul><ul><ul><li>Contains 80% of chloroplasts </li></ul></ul></ul><ul><ul><li>Spongy : attached to lower epidermis </li></ul></ul><ul><ul><ul><li>Loose cells with air spaces </li></ul></ul></ul><ul><ul><ul><li>Fewer chloroplasts </li></ul></ul></ul>
  12. 12. Stomata and Guard Cells <ul><li>Stomata: pores in the epidermis </li></ul><ul><ul><li>Allow water and gas diffusion </li></ul></ul><ul><ul><li>Help cool the leaf </li></ul></ul><ul><li>Guard cells: control stomata opening and closing </li></ul><ul><ul><li>Contain chloroplasts </li></ul></ul><ul><ul><li>Expand and contract </li></ul></ul><ul><ul><li>with water gain and loss </li></ul></ul><ul><ul><ul><li>Gain water : open </li></ul></ul></ul><ul><ul><ul><li>Lose water : closed </li></ul></ul></ul>
  13. 13. Vascular tissues <ul><li>Xylem </li></ul><ul><ul><li>Conducts water and dissolved minerals </li></ul></ul><ul><ul><li>Provides mechanical support for plants </li></ul></ul><ul><ul><li>Dead at maturity (vessels & tracheids) </li></ul></ul><ul><li>Phloem </li></ul><ul><ul><li>Conducts sugars and other solutes </li></ul></ul><ul><ul><li>Alive at maturity (sieve tubes) </li></ul></ul>
  14. 14. Xylem Phloem

×