ch. 35 notes

plant tissue systems, types of cells in plants, plant structure + function

compound tissue

different cell types make it up

common cell types

parenchyma cells, collenchyma cells, sclerenchyma

parenchyma cells

• thin, 1’, primary cell walls

• large vacuoles

• space filling cells

• lots of chloroplasts

leaf primadora

young leaf

meristem

cells maintain ability to divide adding to the plant body

shoot apical meristem

protoderm

procambium

ground meristem

axillary bud meristems

sclerenchyma

• dead @ maturity

• thick 2’ cell wall

• structural support

collenchyma cells

• irregular 1’ cell walls

• flexible supports

• found in young plants

dermal tissues

• aka the epidermis forming on the outermost layer of cells

• flattened

• outermost layer- protection

• regulates exchange within the environment

• trichomes- leaf hairs

ground tissue

• fills spaces

• parenchyma, collenchyma cells

vascular tissue

• main roll is transport / conduction

• rigid support

• xylem / phloem

protoderm

procambium

ground meristem

apical meristem of root

root cap

phloem

• compound tissue- different cell types making it up

  • companion cell

  • sieve tube element = conducting

  • both of the above are always together

  • phloem fibers which are dead @ maturity

• conduct sugar which are dissolved in water

xylem

• compound tissue

  • tracheids- long and hollow (only conducting cells in gymnosperms)

    • fibers- sclerenchyma cells

      • all 3 are dead @ maturity