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.
The main function of meristematic tissue is mitosis. The cells are small, thin-walled, with no central vacuole and no specialized features. Meristematic tissue is located in. 1  the apical meristems at the growing points of roots and stems.2  the secondary meristems (lateral buds) at the nodes of stems (where branching occurs) [ View ], and in some plants, 3  meristematic tissue, called the cambium, that is found within mature stems and roots.eristematic tissue is located in. 1  the apical meristems at the growing points of roots and stems. 2  the secondary meristems (lateral buds) at the nodes of stems (where branching occurs) [ View ], and in some plants,