WorksheetsABA Oxford AQA
Total questions: 16
Worksheet time: 9mins
Where does ABA start in the plant?
Shoot
Root
Guard Cells
Leaf
In what conditions is ABA released? (Pick 2)
Low Salinity
High Salinity
Low Water
High Water
What cells control the opening of stomata?
(a)
What process causes the guard cells to swell and open the stomata?
Diffusion
Osmosis
Active Transport
Facilitated diffusion
Is ABA Lipid Soluble?
Yes
No
To open the stomata, what is the first step that happens in the guard cells?
K+ inwards channels in the guard cells open
H+ ions are actively transported out of the guard cell
Water rushes into the guard cells by osmosis
A water potential inside the guard cell lowers.
To open the stomata, after H+ ions are actively transported out of the guard cell, what is the next step that happens in the guard cells?
K+ inwards channels in the guard cells open
H+ ions are actively transported out of the guard cell
Water rushes into the guard cells by osmosis
A water potential inside the guard cell lowers.
Why does water move into the guard cell when opening the stomata?
There is a decrease in water potential due to the build up of K+ ions
There is an increase in water potential due to the build up of K+ ions
H+ ions have been actively transported out of the guard cell
How does ABA travel from the root to the guard cells?
In the xylem
In the pholem
Through diffusion
Where does ABA act upon the guard cell?
It diffuses into the guard cell and makes ROS
It links to a receptor on the guard cell membrane
It moves through a K+ channel
It is actively transported into the guard cell
When ABA binds to a receptor on the guard cell it causes _______ _______ and other Reactive Oxygen Species to be made?
Hydrogen
Hydrogen Oxide
Hydrogen Peroxide
Calcium ions
Hydrogen Peroxide (an ROS) causes what ions to enter the cytoplasm?
Calcium
Potassium
Ca-
Hydrogen
When ROS causes Calcium ions to enter the cytoplasm, where do they come from? (select 2)
Outside the cell
The Vacuole
Break down of ROS
Chloroplasts
What does ROS inhibit?
K+ inwards channels
H+ Pumps
K+ outwards channels
Ca+ channels
(ABA sequence inside the cell) The rise in Ca ions causes negative ions such as Cl- to leave the cell. What does this do to the cell?
Polarises the membrane
Depolarises the membrane
When ABA acts upon a guard cell, what happens to inwards and outwards K+ channels?
Inwards K+ channels open
Inwards K+ channels close
Outwards K+ channels open
Outwards K+ channels close
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