Plant Biology Practice Test

Tissues produced by apical meristems that lengthen stems and roots form the primary plant body. When cells at the tips of shoots and roots divide, they generate the primary meristems—protoderm, ground meristem, and procambium—that differentiate into the epidermis, ground tissue, and primary vascular tissue. All of these tissues together constitute the primary plant body, which is the plant’s first set of tissues and responsible for primary growth, the elongation of the plant. The process itself is called primary growth, but that term refers to the growth action, not the collective tissues. A root is an organ, not the tissue group produced by apical meristems, and a ray initial is a specific cambial cell, not the whole set of primary tissues.