The outermost layer of plant cells or tissues providing a covering for the body is called the epidermis.

Here's why:

* Epidermis: This is the outermost layer of cells in a plant. It's a single layer of tightly packed cells that forms a protective barrier against the environment. The epidermis can be further divided into different specialized cells, including:

* Guard cells: Control the opening and closing of stomata (pores) for gas exchange.

* Trichomes: Hair-like structures that can provide protection from herbivores, reduce water loss, or even attract insects.

* Root hairs: Extensions of epidermal cells that increase surface area for water and nutrient absorption.

Let me know if you have any other plant anatomy questions!