Tissue is a group of cells , originally one , the same type, or more than one type, located in the same place , engaged in a common function. Banana is basically the aggregate of those cells and their secreted intracellular substance or matrika or dhatrai. There are four main types of bananas based on the structure of the banana , number of characteristics and matriarchal quantity , characteristics, etc.: they are epithelial tissue, connective tissue, muscular tissue, nerve tissue and plant tissue. Namely: Permanent banana and dividing banana. Permanent tissue is not capable of dividing and its origin occurs from dividing tissue. 3 types of permanent tissue. These are: - Simple Tissue Complex Tissue Secretory or Leaky Tissue Simple Tissue: - The permanent tissue which is uniform in size , shape and structure of each cell is called simple tissue. Simple tissue is divided into 3 parts based on the nature of the cell. Parenchyma cholenkaima sclerenchyma complex tissue: - A permanent tissue that consists of multiple types of cells and collectively performs the same type of work is called complex tissue. There are two types of complex bananas according to the nature of work , location and structure. For example: a) xylem banana b) phloem banana xylem banana: - The word xylem is derived from the Greek word xylos whose English synonym is wood, in Bengali it is called wood. Scientist Nagali coined the term in 1856. Wood or xylem is one of the main constituents of plants. The wood that is found in various works is called secondary xylem.