Tissue is defined as that network of cells joined together that form a structure and that, in addition, fulfill the same function; to excrete, means to launch, in some way, different types of matter, therefore excretory tissues are those structures found in plants, through which substances can be expelled.
They are made up of various cells, all of them programmed or specialized in the task they are going to perform: helping fruits or plants to excrete liquids that are considered important within their characteristics, properties, and even that they are not necessary.
The small pockets or holes are very easy to notice if an exhaustive admiration is used in the object under investigation; A common example is that of the orange, which has some bags, where it brings out a substance with a strong smell and that causes a rapid burning in the eye area, if it comes to touch. Likewise, conifers and terebintáceas exclusively obtain a viscous substance, which can harden with contact with air and soluble in alcohol; it is excreted through minimal holes, considered excretory tissues.
Together with these tissues, they also work with others, which help to improve the entire plant itself, among them are: growth tissues, which are only made up of young cells, which reproduce continuously through mitosis; the parenchymal tissues, being that cellular structure that is in charge of nourishing the plant or fruit; protective fabrics, which keep the plant away from the outside; conductive tissues are species of tubes through which all the nutritive substances circulate, so that they reach the entire plant; Finally, the support tissues are those that define the contour and strength of the plant.
