plant tissues Flashcards
where is the upper epidermis placed?
very top of the leaf
What is the upper epidermis’s role
it is transparent which allows light to pass through to the cells that photosynthesise
what is the roles of the epidermis?
protect the surface of the leaf
what is the waxy cuticle?
covers upper epidermis and reduces evaporation of water on leaf surface
what does the waxy cuticle stop?
leaf from drying out
What are the pores in the lower epidermis called ?
the stomata
what does the stomata do?
carbon dioxide to enter leaf and the oxygen to leave - helps water vapour that can pass out of leaf
where are the guard cells?
either side of the stomata
where are the paliside mesophyll ?
below upper epidermus
what does the paliside mesophll contain ?
paliside cells which contain chloroplasts - absorbs light energy for photosynthesis
What is underneath the paliside mesophll?
spongy mesophll
what is the key feature of the spongy mesophll?
air spaces - allows carbon dioxide to diffuse from stomata through spongy mesophll to paliside cells
Where does oxygen diffuse from ?
the paliside cells through spongy mesophll to stomata
What does the xylem transport ?
transports water from roots to stems and the leaf
what does the xylem also transport?
dissolved mineral ions
