Transport in Plants Flashcards
What is Xylem?
Hollow, Lignified vessels with no end walls that transports water
What is Phloem?
Transports sucrose and amino acids
a few functions of root hair cells are…
- Large surface area to collect water
- Thin cell walls so water can be easily taken in
- Contain lots of mitochondria so active transport can take place
Pathway of water is…
Root, root cortex cells, xylem, mesophyll cells
the large surface area of root hairs…
increases the rate of the absorption of water by
osmosis and ions by active transport
the xylem vessels..
transport water from the roots to the leaves
what is transpiration?
the loss of water vapour
from plant leaves by evaporation of water
how does temperature affect transpiration rate?
-as temperature increases transpiration rate increases
how does humidity affect transpiration rate?
-as humidity increases transpiration rate falls
Lots of water vapour is lost when…
The many interconnecting air spaces between these cells and the stomata creates a large surface area.
This means evaporation can happen rapidly when stomata are open
Transpiration uses:
transporting mineral ions
providing water to keep cells turgid in order to support the structure of the plant
providing water to leaf cells for photosynthesis
keeping the leaves cool
Explain the mechanism by which water moves
upwards in the xylem
a transpiration pull that draws up a column of water molecules,
held together by cohesion
What is Translocation?
the movement of
sucrose and amino acids in phloem:
– from regions of production (source)
– to regions of storage OR to regions where
they are used in respiration or growth (sink)
What is Translocation?
the movement of
sucrose and amino acids in phloem:
– from regions of production (source)
– to regions of storage OR to regions where
they are used in respiration or growth (sink)
