OBJECTIVE FORESTRY

Detailed explanation-1: -Wood is a product of secondary growth in a plant. This secondary growth arises from the vascular cambium, which creates secondary vascular bundles (i.e. secondary xylem and phloem) after initial cell elongation and growth of a plant has ceased. Wood is mainly composed of the secondary phloem.

Detailed explanation-2: -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-3: -The cortex and the epidermis form at the time of primary growth. These are replaced by the periderm in the plants which exhibit secondary growth. The periderm is produced by the cork cambium. It comprises the phelloderm, cork, and cork cambium cells.