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Anatomy of Flowering Plants

The Tissues

A group of cells derived from a same origin and performing same function is defined as tissue. In plants, based on the dividing capability of cells, the tissues are classified into two types namely, meristematic and permanent tissues.

Meristematic Tissues

Meristematic tissue is defined as the restricted growth in plants in specialized regions of active cell divisions. Different kinds of meristems are observed in plants. The meristematic tissue observed in tips of roots and shoots is called as apical meristems. The root apical meristem is present at the tip of the root and the shoot apical meristem is found at the distant most region of the stem axis. During the elongation of the stem and other parts of the shoot system, few cells constitute the axillary bud, which is further potential of forming a branch or flower. During the formation of primary plant body, the apical meristem specializes in producing dermal tissues, ground tissues and vascular tissues.

A.    Root                                        B. Shoot

 

Anatomy of Flowering Plants Homework Help

The meristem that occurs between mature tissues is defined as the intercalary meristem. This meristem is responsible for regenerating parts that are removed through environmental stress like feeding of animals etc. Both apical meristems and intercalary meristems are primary meristems as they occur early in plant life, thus contributing to the formation of plant body.

Secondary or Lateral Meristem

It is defined as the meristem that produces secondary tissues of plants that produce woody axis and is found in the mature regions of roots and shoots and appears later than primary meristem. Different types of secondary meristems are cylindrical meristems, fascicular vascular cambium, interfascicular cambium and cork-cambium.