Gaseous exchange in plants occurs through pores in the stomata ( plural) ( singular : stoma ) . They are found on the epidermis of leaves . In dicotyledonous leaves , more stomata on the lower epidermis than on the upper epidermis . This is because to reduce the water loss by transpiration .In monocotyledonous leaves stomata are found on the two epidermal layers . Besides , lenticels found in bark of stem and root hairs with thin walls and large surface area also allow gaseous exchange to take place. A stoma consists of a pair of guard cells and a stomatal pore .
( Biology lesson )
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