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Questions and Answers
What is the main purpose of stomatal opening in plants?
What is the main purpose of stomatal opening in plants?
- To release excess water into the atmosphere
- To allow the entry of CO2 for photosynthesis (correct)
- To regulate the uptake of minerals from the soil
- To protect the plant from pathogens
What triggers the turgor in guard cells resulting in stomatal opening?
What triggers the turgor in guard cells resulting in stomatal opening?
- Decrease in air temperature
- Decrease in carbon dioxide levels
- Increase in light intensity
- Active uptake of potassium and malate (correct)
What is the role of guard cells in the stomatal opening and closing process?
What is the role of guard cells in the stomatal opening and closing process?
- To provide structural support to the stoma
- To actively pump water out of the stomata
- To synthesize chlorophyll for photosynthesis
- To regulate the opening and closing of the stoma (correct)
Why must the stomata be open at least part of the time in plants?
Why must the stomata be open at least part of the time in plants?
What is the main outcome of the turgor in guard cells during stomatal opening?
What is the main outcome of the turgor in guard cells during stomatal opening?
Flashcards
Stomatal Regulation
Stomatal Regulation
The process of opening and closing the stomata to control gas exchange and water loss in plants.
Why are stomata open?
Why are stomata open?
The primary function of the stomata is to allow carbon dioxide (CO2) to enter the leaf for photosynthesis.
How do stomata open?
How do stomata open?
The opening of stomata is triggered by the active uptake of potassium (K+) and malate ions by the guard cells, increasing their water potential and causing them to swell.
What are guard cells?
What are guard cells?
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What is the result of turgor in guard cells?
What is the result of turgor in guard cells?
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Study Notes
Stomatal Opening in Plants
- The main purpose of stomatal opening in plants is to allow for gas exchange, specifically for CO2 uptake and O2 release during photosynthesis.
Turgor in Guard Cells
- Turgor in guard cells is triggered by the absorption of potassium ions (K+), which increases the water potential inside the cells, causing the guard cells to swell.
Role of Guard Cells
- Guard cells play a crucial role in the stomatal opening and closing process by controlling the stomatal aperture through changes in turgor pressure.
Importance of Stomatal Opening
- Plants must keep their stomata open at least part of the time to allow for gas exchange and maintain proper cellular processes, as stomatal closure can lead to CO2 depletion and impaired photosynthesis.
Outcome of Turgor in Guard Cells
- The main outcome of turgor in guard cells during stomatal opening is the increase in stomatal aperture, allowing for increased gas exchange and CO2 uptake for photosynthesis.
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Description
Test your knowledge on the mechanisms of transport in plants, including water and mineral absorption, xylem transport, rate of transpiration, and water-stress responses based on Chapter 36 of the Thirteenth Edition Biology textbook by Raven, Johnson, Mason, Losos, and Duncan.
