Download not full of water

 Homeostasis – balance of a system
o Turgid – full of water (crisp)
o Flaccid – not full of water
 Wilting – when plants are not full of water
 Transpiration – loss of water by a plant
o Water is taken up through the roots and the leaves through the stomata
o Stoma (stomata) are the pores on the bottom of the leaf
 Guard Cells regulate the opening and closing
o When the guard cells are turgid, they pull apart from each
other, opening the stomata and allowing gas and water to
leave
o When guard cells are flaccid, they seal the stomata shut,
preventing water loss
o When the stoma are open, the plant can undergo
photosynthesis
o When the stoma are closed, no photosynthesis can take
place because there is no gas exchange
 Factors That Affect Transpiration Rate
o Light
 Brighter light INCREASES transpiration
 The stomata opens wider to allow for gas exchange during
photosynthesis
o Temperature
 Higher temperature = FASTER transpiration
OR
 Lower temperature = SLOWER transpiration
 Evaporation and diffusion are faster at higher temperatures
o Wind
 Windy conditions = FASTER transpiration
 Water vapor is removed quickly by air movement, speeding up
diffusion of more water vapor
o Humidity
 Humid conditions = SLOWER transpiration
 Diffusion of water out of leaves slows down if
the leaf is already surrounded by water vapor