Answer: Dermal tissue
Step-by-step explanation:
In angiosperms the epidermis or the dermal tissue is the single layer that consists of cells that cover almost all plant parts such as leaves, flowers and stems. It forms an external boundary that separates the internal environment of the plant with the external surrounding environment.
The dermal layer performs several functions such as it protects the loss of water, regulates the exchange of gases, absorbs water and minerals from the external environment and secrete metabolic compounds as wastes.