Leaves
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What are the main functions of leaves?
photosynthesis to create food and to maintain the water balance for the plant through transpiration
What chemical signal will trigger cell division at the apical meristem to form leaves?
auxin
Auxin will trigger cell division at the apical meristem, which will form
leaf primordium.
groups of cells that will form new leaves
leaf primordia
the location of leaf primordia is called
phyllotaxy
Cell division and expansion of the “” and “” in this area will produce a vascular strand which will eventually become the midvein and the epidermis.
procambium and protoderm
A layer of cells called the “” covers the entire surface of the leaf and is continuous with the “” of the stem
epidermis
the epidermis is covered with a “” layer
cuticle
openings in the epidermis are called “” and are borded by 2 gaurded cells which do contain chloroplasts
stomata
openings in the epidermis are called stomata and are borded by 2 “” which do contain chloroplasts
gaurd cells
”” regulate the opening and closing of the stomata, allowing the gasses necessary for photosynthesis to move into and out of the leaf
gaurd cells
water vapor also moves out of the leaf through the stomata by “”
transpiration
”” cools the leaf surface by evaporation and also helps pull water through the plant.
transpiration
Although transpiration, gas exchange for photosynthesis and respiration are vital to the plant, the plant must have the ability to close the gaurd cells to reduce water loss during times of stress (True/False)
true
the lower epidermis usually contains numerous “”, each formed by a pair of guard cells that regulate both evaporation of water vapor from the leaf and gas exchange between the interior and atmosphere.
stomata
”” do not contain chloroplasts
epidermal cells
what is the epidermis of a leaf covered with?
cuticle
high “” triggers leaf primordium
auxin
”” regulate the opening and closing of the stomata, allow the gasses necessary for photosynthesis to move into and out of the leaf
guard cells
”” cells will undergo cell division to thicken the leaf and to form the blade and petiole
meristematic cells
Gaurd cells will open and close in response to “”.
pressure changes
Gaurd cells open and close in response to environmentally induced pressure changes. The movement of “” and “” in response to light intensity, CO2 concentration or water concentration triggers pressure changes
potassium and water
What triggers pressure changes for the stomata to open and close?
movement of potassium and water
As potassium ions move, water follows by osmosis causing a change in “” in the guard cells.
cell shape