DENDROLOGY

Detailed explanation-1: -C: The cambium cell layer is the growing part of the trunk. It annually produces new bark and new wood in response to hormones that pass down through the phloem with food from the leaves.

Detailed explanation-2: -The rhytidome is the most familiar part of bark, being the outer layer that covers the trunks of trees. It is composed mostly of dead cells and is produced by the formation of multiple layers of suberized periderm, cortical and phloem tissue. The rhytidome is especially well developed in older stems and roots of trees.

Detailed explanation-3: -Sapwood : It is outer annual rings between heartwood and cambium layers. It is the living, outermost portion of a woody stem or branch.