5 Questions
What is the main purpose of stomatal opening in plants?
To allow the entry of CO2 for photosynthesis
What triggers the turgor in guard cells resulting in stomatal opening?
Active uptake of potassium and malate
What is the role of guard cells in the stomatal opening and closing process?
To regulate the opening and closing of the stoma
Why must the stomata be open at least part of the time in plants?
To allow CO2 entry for photosynthesis
What is the main outcome of the turgor in guard cells during stomatal opening?
Reduction in water potential
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.
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.
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