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Nat5 Multicellular

Plant transport and transpiration

What is the role of phloem? To transport sugars from leaves around the plant
What is the role of xylem? To transport water from roots up the plant
What is transpiration? process by which water is pulled up the plant
Why do plants need water? for light dependent stage of photosynthesis
Which factors increase the rate of transpiration? increased temperature, increased wind, lower humidity
What strengthens xylem? rings of lignin
What cells help phloem survive? companion cells
what is the role of waxy cuticle on a leaf? prevents water loss
what is the role of epidermis in a leaf? protection
what is the role of mesophyll in a leaf? it is where most of photosynthesis occurs.
what are two types of mesophyll? palisade and spongy
what are stomata? holes where gas exchange occurs in lower epidermis of leaves
what are guard cells? cells that control opening and closing of stomata
how do stomata open? water enters the guard cells by osmosis (they become turgid) and stomata opens
how do stomata close? water leaves the guard cell by osmosis (they become plasmolysed) and stomata close
How does transpiration work? water evaporates through open stomata which draws more water up from roots
What plant cells absorb water from the soil? root hair cells
How are root hair cells adapted to absorbing water? they have a large surface area.
what gas enters the leaves through stomata? carbon dioxide
Why does carbon dioxide need to enter leaves? to be used in carbon fixation stage of photosynthesis
What gas leaves the leaves through stomata? oxygen
Where does the oxygen that leaves leaves come from? it is a byproduct of light dependent reaction in photosynthesis
Are stomata open during the day or at night? stomata are open during the day
Are stomata closed during the day or at night? stomata are closed during the night
Why are stomata open during the day? when there is light plant needs to be able to do gas exchange for photosynthesis
why are stomata closed during the night? there is no light so photosynthesis does not occur, stomata are closed to conserve water
Created by: dr.prorocic