Correction on How the movement of water opens/closes stomata

Thanks to a question posed by Maddie D. in second block, it allowed me to further analyze the opening and closing of stomata in the epidermis of the leaf.

Using workbook page 71 and textbook page 477 (and the diagrams on both) as you read through this description of the events needed to open and close the stomata.

Here is the situation that occurs to allow the guard cells to open (reverse process to close)

1. Need for more Carbon Dioxide in cells due to increased photosynthetic activity
2. K+ ions enter guard cells (through active diffusion)
3. The increase in K+ ions in the guard cells, decreases the water concentration in the gaurd cells allowing water to flow into the cells from surrounding epidermal cells
4.  The increase in Turgor pressure OPENS the stoma (this is what I had backwards this morning)


M.D. thank you for being prepared and asking about this in class.

Again I apologize for any confusion and will clarify on Monday. -Mr. Cheney