An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata.
Answer the following statement true (T) or false (F)
False
Clarify Question
• What is the key concept addressed by the question?
The key concept is root pressure.
• What type of thinking is required?
You are being asked to take what you already know and apply it to changing root pressure in a plant.
• What key words does the question contain and what do they mean?
o Root pressure is an accumulation of ions in root tissue, which causes an influx of water.
o ABA is a plant hormone that causes stomata to close.
o Stomata are openings on leaves that allow gas exchange to occur.
Gather Content
• What do you already know about root pressure and its effect on ABA? How does it relate to the question?
o Increasing root pressure causes guttation, which is the loss of water from small veins in the leaf.
o Guttation bypasses the stomata.
Consider Possibilities
• What other information is related to the question? Which information is most useful?
o ABA acts to close the stomata.
Choose Answer
• Given what you now know, what information and/or problem-solving approach is most likely to produce the correct answer?
o If you connect root pressure to guttation and not ABA and stomata, you will arrive at the correct answer.
Reflect on Process
• Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to separate the effects of root pressure from those of ABA. Answering this question correctly depended on your ability to use root pressure in a new situation. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you remember that root pressure is connected to guttation or that guttation is unrelated to the stomata? Did you have trouble extending root pressure to determine the correct answer?
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