EVERYDAY SCIENCE

Detailed explanation-1: -The bark of the tree comprises all the tissues outside the vascular cambium . Various kinds of cell layers that constitute the bark are – Periderm (phellogen, phellem and phelloderm), primary cortex, pericycle, primary and secondary phloem. These all tissues are present outside the vascular cambium.

Detailed explanation-2: -Bark technically comprises all the tissue outside the vascular cambium of a plant with true wood (see Chapter 10). The outer bark, or periderm, are the tissues derived from the cork cambium itself.

Detailed explanation-3: -Bark consists of all of the tissue layers external to the vascular cambium. It protects the plant against physical damage and helps reduce water loss. In a one-year stem from inside to outside, this would be the secondary phloem, primary phloem fibers, cortex, phelloderm, cork cambium, and cork.

Detailed explanation-4: -The inner soft bark comprises secondary phloem tissue, whose innermost layer conducts food from the leaves to the remaining parts of the plant.

Detailed explanation-5: -Secondary xylem and secondary phloem are produced from a cylinder of meristematic tissue within the woody stems and roots. This cylinder of meristematic tissue is the vascular cambium.