Gas Exchange in Plants Flashcards
air consists of
oxygen carbon dioxide water vapour nitrogen other gases
most important gas exchange organ
leaves
lens-shaped openings perforating bark
allow gas exchange between bark and living cells
lenticels
is gas exchange tied to water loss
yes
when air diffuses out of stomata, some water lost (T/F)
T
plants can loose up to 80% of water absorbed by roots (T/F)
F
99%*
guard cells do what to prevent plant cells from drying out
change shape
a tree can loose 200L water/day (T/F)
T
Turgor pressure
pressure inside cells increased by water moving into guard cells via osmosis which causes swollen cells
what does turgor pressure cause cells to remain as
rigid
when transpiration occurs what happens to turgor pressure
lowers
cells deflate
what acts as skeleton in non-woody plants
turgor pressure
factors affecting transpiration rate
light
temperature
humidity
