Materials: Procedures: .......layer of clear nail polish on the underside of the leaf in a1 cmtimes 1cm square. 2. Allow the nail polish to dry complétely and then place a piece of CLEAR cellophane tape over the nail polish, make sure to not leave fingerprints on the tape. 3. Slowly peel the tape off of the leaf. The nail polish should now be stuck to the tape. 4.Place the tape directly onto the microscope slide and place it under the microscope. __ RESULTS: Draw the Guard Cells and stomata What is the function of the Guard cells what causes them to close?

The function of the guard cells is to regulate the opening and closing of the stomata, which are small openings on the surface of leaves that allow for gas exchange. Guard cells control the size of the stomatal opening by changing shape in response to environmental conditions.<br /><br />Guard cells close when they lose water and become flaccid, which happens when the surrounding air is dry or when the plant is experiencing water stress. This closing of the stomata helps to reduce water loss from the leaf and prevents excessive water loss during periods of drought or high temperatures.