Types discussion: Autism (a developmental brain disorder characterized by impaired social interaction and communication skills, and limited range of activities and interests) is the most characteristic and best studied PDD.
A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of the plant and keep the plant growing.hese secondary meristems are also known as lateral meristems because they are involved in lateral growth. At the meristem summit, there is a small group of slowly dividing cells, which is commonly called the central zone.
Abstract. Meristems refer to a group of undifferentiated dividing cells that are responsible for the formation of plant organs. Floral meristems are a group of dividing cells that give rise to flowers. The formation of a floral meristem and its subsequent fate are under both environmental and molecular control.eristems refer to a group of undifferentiated dividing cells that are responsible for the formation of plant organs. Floral meristems are a group of dividing cells that give rise to flowers.