What are the small pores in a leaf called?

Answer:The tiny holes or openings called stomata are found in the leaf epidermis and young stems. On the underneath of the leaves, stoma is highly numerous. They allow for the transfer of gases here between outside atmosphere and the branching network of interconnected canals of air. All terrestrial plants contain stomata. The number, size, and placement of stomata vary greatly in vascular plants. There is roughly 400 ppm of carbon dioxide in the atmosphere, which aids in photosynthesis. Since plants exhale more oxygen at night, most plants need their stomata to be open throughout the day (Oxygen).