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Ch. 7 Roots, image, https://image.shutterstock.com/image-vector/taproot…

- - - - brace against being blown over
      - upper side grows more rapidly
  - - - both benefit
    - - penetrate between outermost cortex cells
    - - penetrate cortex but cannot pass Casparian strip
  - - - chemical conversion of atmospheric nitrogen
    - - how bacterium pushes into cell
    - - form symbiosis with bacteria
- - - - no disruptions
    - - mitotically inactive center
  - - - undergo cell division
        
        forms files of cells pushed
    - - proliferate
  - - - increase water & mineral absorption
    - - cortical cells differentiate into
    - - bands of altered walls
    - - between vascular tissue & endodermis
  - - - thought to be passageways for minerals
      - really just slow to develop
    - - caused by absorption of minerals
- - - - many monocots & some eudicots
      - mass of similar sized roots
    - - root primordia in stem tissue
      - do not arise on pre-existing
      - not radicle
      - increase absorption & transport
    - - comes out of taproot
      - lateral roots produce themselves
    - - prominent
      - develops from radicle
  - - - lubricates passage of root
      - secreted by dictyosomes
    - - cells undergo division & expansion
    - - protects root apical meristem
      - thick layer of cells
      - constantly renewed
    - - epidermal cells extend
      - Root hairs
        
        form only in part not elongating