AP BIOLOGY

Detailed explanation-1: -Wood is constituted by secondary xylem tissue, comprising parenchyma cells and conduits (vessels or tracheids).

Detailed explanation-2: -Wood tissue is the tissue that makes up the xylem of a tree. The main types of wood tissue are xylem parenchyma, xylem ray, and xylem vessels.

Detailed explanation-3: -Secondary xylem (wood) and phloem are the inner and outer derivative products of the vascular cambium. Xylem is mainly comprised with dead cells with thickened cell walls rich in cellulose, hemicelluloses, and lignin and responsible for providing mechanical support and conducting water and minerals for the plant.

Detailed explanation-4: -In woody plants secondary xylem comprises the bulk of the tissue in the stems and roots. It is the most important supporting tissue in arborescent dicotyledons and most gymnosperms, and the major tissue for the transport of water and essential minerals in woody plants.

Detailed explanation-5: -The inner layer of secondary xylem forms the heartwood and the outer layer forms the sapwood. The sapwood contains young layers of the tree and it performs water conduction in large woody trees. Thus, the common name of wood is called secondary xylem.