Question

The cambium is
A. Apical meristem
B. Lateral meristem
C. Intercalary meristem
D. Secondary meristem

Answer 1

Hint:Many dicotyledonous plants exhibit an expansion in girth. This rise is considered as secondary growth. Cambium is responsible for the development of secondary tissues.

Complete answer:
The plant tissues are divided into two main types, meristematic and permanent tissues, according to the cell's capability of division. The meristematic tissues are those that are the site of active division. Permanent tissues in plants are those that are no longer undergoing division.

In a plant we can see three types of meristematic tissues: apical meristem, intercalary meristem and lateral meristem. Apical meristem is found in the tips of roots and shoots. Intercalary meristem is located at the leaf blades and base of nodes in stems. Lateral meristem is found in the woody part of the plants. It is also known as a secondary meristem.
The tissues involved in secondary growth are the two lateral meristems: vascular cambium and cork cambium. The meristematic layer responsible for the cutting off of vascular tissues is called vascular cambium. Cork cambium is a meristem that grows from parenchymal cells in the cortex. It forms an outer cork layer that lies beyond the vascular cambium. Cork cells are dead cells that provide protection from infections and injury to internal cells.

Thus, the correct answer is lateral meristem.

Note:Secondary growth occurs in most dicotyledonous roots and stems and expands the girth of the tissues by the action of the vascular cambium and the cork cambium. Infact, wood is actually a secondary xylem.