With the aid of a microscope you are examining the cells which border a stoma and regulate its opening and closing,which are

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Each stoma (pl. ,stomata)is a small pore in the leaf epidermis bordered by modified epidermal cells called guard cells.When water enters the guard cells and turgor pressure increases,the stoma opens;when water exits the guard cells and turgor pressure decreases,the stoma closes.

With the Aid of a Microscope You Are Examining the Cells