Bulliform cells\xa0are the\xa0cell\xa0that is spread among the leaf\’s epidermal\xa0cells. They are essential for water storage. During stress circumstances,\xa0bulliform cells\xa0assist to roll leaves to avoid water loss through transpiration. Therefore, they control the process of transpiration.\xa0Bulliform cells\xa0or the motor\xa0cells\xa0are the modified epidermal\xa0cells\xa0present on the upper surface or the adaxial surface of the monocot leaf (the grasses). They regulate the rolling of leaves to prevent the loss of water. When water is adequately present, they become\xa0turgid\xa0and keep the leaf open and exposed.