Common features between lenticels and hydathodes are
The large sized, slightly raised spots present on the surface of cork, in old dicot stems are called Lenticels. These are involved in the exchange of gases.
The small pores, present on the epidermis of grass leaves are called Hydathodes. In this guard cells are immovable. They perform guttation.
So, the correct option is ‘There is no regulation of their opening and closing’.