plant tissues DEFINITELY IN EXAM Flashcards
what is the leaf
an organ
equation for photosynthesis
carbon dioxide + water —> glucose + oxygen
what do the epidermis do
protects the surface of the leaf
name one adaptation of the upper epidermis and what does this allow?
the upper epidermis is transparent
this allows light to pass through to the photosynthesis cells below
what does the waxy cuticle do
reduces the evaporation of water from the surface of the leaf (prevents the leaf from dying out)
what do the stomata do
stomata allow carbon dioxide to enter the leaf and for oxygen to leave
Also control the amount of water vapour that can pass out of the leaf
what do guard cells do
allow gas exchange and control water loss within the leaf
what do palisade cells do
contain chloroplasts which contain chlorophyll which absorbs the light energy needed for photosynthesis
what does the spongy mesophyll do
the spongy mesophyll is full of air spaces which allow carbon dioxide to diffuse from the stomata through the spongy mesophyll to the palisade cells
what does xylem tissue do
transports water from the root to the stem and leaves some of the water is then used in photosynthesis. The xylem also transports mineral ions these include magnesium which is used to make chlorophyll
what does phloem tissue do
phloem tissue transports dissolved sugars produced by photosynthesis from the leaves to the rest of the plant
(this sugars can be used immediately e.g: glucose is used in respiration or the sugars can be stored as starch)
define translocation
the movement of sugars and other molecules through the phloem tissue
where do you find meristem tissue
meristem tissue is found at shoots and roots
what can of cells do meristem tissue contain and what can these do?
meristem tissue contains stem cells which can differentiate into different types of plant tissue
