Lab 7 191L

Dermal tissue system

epidermal cells and guard cells

Guard cells close the ___

stomata

Second layer of dermal tissue

endodermis

Vascular tissue system

xylem and phloem

Xylem is composed of

xylem tracheids and vessel elements

Phloem is composed of

phloem sieve-tube members and companion cells

Xylem transports

water

Phloem transports

“food”

For xylem and phloem the LET acronym stands for

Living cells

End walls
Two way flow

Vascular bundles

clusters of xylem and phloem

Ground tissue system

everything not included into the vascular and dermal tissue systems

Parenchyma

cells with thin primary cell walls that store food, function in metabolic activities, photosynthesis, water balance, and healing (majority of the ground tissue)

Fibers

supportive functions

Spongy mesophyll

Loosely packed photosynthetic cells that captures light and helps with gas exchange

Palisade mesophyll

tightly packed photosynthetic cells that captures light efficiently (main source in dicot plants)

Tracheids

water conduction function

vessel elements

water conduction function

Sieve-tube members

function in food distribution

companion cells

aid in the movement of food into and out of the sieve-tube members