B Flashcards
B4
What is transpiration (xylem)
evaporation of water out of the leaf
What is translocation (phloem)
movement of dissolved sugars form the leaves to the rest of the plant
where are stem cells in plants
meristem
what effects the rate of transpiration
increase in temperatue
increase in airmovement
decrease in humidity
state the order of a leaf cell
waxy cutile
upper epidermis
palisade mesophyll
spongy mesophyll
lower eperdermis
stomata
what does the waxy cutile do
waterproof to stop water loss at the top of the leaf
what does the upper eperdermis do
transparent to let light through
what does the palisade mesophyll
lots of chlorophyll for photosynthesis
what does the spongy mesophyll do
gaps for gas exchange (large SA)
what does the stomata do
used for gas exchange
what does guard cells do
control the rate of gases entering and leaving
which direction can the xylem move
only one direction (upwards)
which direction can the phloem move
both directions (upwards and downwards)
