Mas Transport In Plants
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What conditions affect water inside plants
Temperature Light intensity Humidity Wind
What occurs to the stomata when the temperature is to high
Water gains kinetic energy So evaporates at faster rate
What affect does humidity have on the opening of the stomata
Lots of water vapour So WP m is formed and is greater outside So reduces the m
What is meant by transpiration
Loss of water vapour from the stomata by evaporation
What happens when water vapour evaporates out of the stomata of leaves
Decreases the volume and pressure
What happens when transpiration occurs
Water potential gradient is formed. More water if forced to replace it upwards
What happens to the roots when transpiration occurs
Volume of water increases So does pressure
Why is the roots under negative pressure/tension
When water is pulled up the xylem/water column
Why can the water molecules stick together
Because they are bonded by hydrogen bonds
How is a column of water created in the xylem
When there is cohesion between the water molecules Cause if the hydrogen bonds
What do the water molecules adhere to
Walls of the xylem
Why do the water molecules adhere to the xylem
Helps to pull water column upwards
Why does the xylem get narrow
When the water is pulled through the xylem
What is the xylem made up of
Dead cells Lignin Hollow
What is the role of translocation
The movement of sucrose and amino acids in a plant
Where is the sucrose made from during translocation
Respiration
What is found in the companion cell
H+ ions
What is the phloem made of
Sieve tube elements Companion cells
What is an adaptation of companion cells
Have many mitochondria Provides ATP for active transport
What are sieve tube elements made from
Living cells No nucleus
Why also sieve tube elements have fewer organelles
For maximum flow
What is the movement of sucrose from the SOURCE into thé companion cell
High in source low in companion cell Moves down gradient Via facilitated diffusion into companion cell
What mode of transport does sucrose take from the source
Facilitated diffuse
Where is sucrose made
Photosynthesis