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TRANSPORT OF NUTRIENTS (Plants), Stomata, Sugar transport :arrow_down:,…
TRANSPORT OF NUTRIENTS
(Plants)
Xylem
:droplet:
Cohesion-Tension Model
: Water moves from high (soil) to low (root hairs) concentration. The water entering the root will cause pressure that helps move up.
How can water go up
against
gravity without requiring cellular energy?
Transports
water
and nutrients from root to leaves :arrow_up:
Transpiration :sweat_drops: :leaves:
Hydrogen bonds will create a chain of water molecules that are stuck together (
COHESION
)
The chain of water that is being pulled by
evaporation
will cause a tension and pull every water molecule
up
Water will
evaporate
through leaf' stomata
Phloem
:cake:
Transports
sugar
from source to sink :arrow_down:
Pressure-Flow Model
: The sugar is actively transported from the cells in the leaf mesophyll (source) through the sieve tubes of the phloem, into the roots (sink).
This process requires energy :zap:
Translocation :cookie: :left_right_arrow: :sweat_drops:
There is an increase in positive pressure as water flows in
High concentrations of sugar in the sieve tubes cause water to follow by osmosis
In the root the sugar is used for cellular respiration or other metabolic processes.
Think about this process as drinking from a straw :tropical_drink:
Stomata
A plant cell full of water will bulge (
Turgor Pressure
)
The stomata will close when the plant is under stress and/or dehydrated
Sugar transport :arrow_down:
Water transport :arrow_up:
