FORESTRY
PLANT AND WOOD ANATOMY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
all the tissue outside the vascular cambium
|
|
|
all the tissue outside the cork cambium
|
|
|
only the cork
|
|
|
just inside the cork cambium
|
|
|
just inside the vascular cambium
|
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: -Phellogen layer or cork cambium is a dividing zone of cells that forms phellem to the outside and phelloderm to the inside. In other words, it forms the outer bark. This cambial zone is constantly on the move outward as the tree grows.
Detailed explanation-3: -Cork cambium is the tissue seen in several vascular plants as a portion of the epidermis. Found between the cork and the primary phloem, it is one of the several layers of the bark. Cork cambium is the lateral meristem that is accountable for secondary growth substituting the epidermis in the roots and stems.
Detailed explanation-4: -Cork is obtained from the bark of a tree. Bark is the outermost layer of stems of woody plants. It includes all the tissues outside the vascular cambium. Robert Hooke observed a piece of this cork cell using a primitive microscope and discovered cell in 1665.