Final answer:
The epidermis is the tissue that encloses leaves, providing protection and waterproofing via a waxy substance called the cuticle.
Step-by-step explanation:
The tissue that encloses leaves and provides protection and waterproofing is known as the epidermis. This dermal tissue acts like the skin of the plant and is primarily made up of a single layer of cells that cover and protect the underlying tissues of leaves and stems. The epidermis secretes a waxy substance called the cuticle, which helps to prevent water loss, protects against infections, and provides a barrier against environmental damage. In addition to these protective functions, the epidermis also features specialized structures such as stomata and trichomes. Stomata are important for the regulation of gas exchange and transpiration, while trichomes can deter herbivory and further reduce water loss.