Simple tissues are made up of only one type of cells, which look like each other. On the other hand. complex tissues are made up of more than one type of cells. Parenchyma, collenchyma and sclerenchyma are examples of simple plant tissue, whereas xylem and phloem are examples of a complex tissue. Simple tissues are protective and supportive in function. Complex tissues conduct water, minerals, and nutrients from roots and leaves to different parts of the plant.