Final answer:
Collenchyma is a type of simple tissue in plants that provides structural support. These cells have unevenly thickened walls and are commonly found below the epidermis. An example of collenchyma cells are the "strings" in a celery stalk.
Step-by-step explanation:
Collenchyma is a type of simple tissue in plants that is formed from elongated cells with unevenly thickened walls. These cells provide structural support, particularly to the stem and leaves of plants. They are alive at maturity and are typically found below the epidermis. A common example of collenchyma cells are the "strings" of a celery stalk.