CT scan. A computed tomography (CT) scan is an imaging method that uses x-rays to create pictures of cross-sections of the body. How the Test is Performed. You will be asked to lie on a narrow table that slides into the center of the CT scanner. Once you are inside the scanner, the machine's x-ray beam rotates around you.
If it is a submerged leaf, no stomata will be present on either side. In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the under-surface (epidermis) of a plant leaf, and used for gas exchange.The pore is formed by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening. years ago. Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. As these leaves are held horizontally, upper epidermis is directly illuminated. Locating fewer stomata on the upper epidermis can then prevent excess water loss.
Stomata are found on the lower side of the leave because they are the gateway for gas exchange, and gas surrounds the plant on all sides. If they are found more commonly on thâ¦e bottom side of leaves, it is likely because the direct sunlight on superior leaf surfaces would cause increased evaporation via stomata, which i snot good for the plant.