It is used as a national identification number, tax payer number, social insurance number,driver's license number, for employment, etc. It is also commonly used as a customer number in banks, retailers, insurance companies, airlines, etc. Until the end of August 2013, the RUN was also used as the passport number.
The sclerenchyma cells are usually elongated, with tapering ends. Such cells are commonly described as sclerenchyma fibres. In some cases, the cells are shorter and irregular in shape. Such cells are commonly described as sclereids or stone cells.
In addition, special types of sclerenchyma cells known as fibers, tracheids and vessel elements from important cellular components of the xylem or wood. Sclerenchyma in the form of fibers occurs in the phloem, which like the xylem is a conducting or vascular tissue.The walls of sclerenchyma cells are highly variable and you will see some of the most important types in this laboratory.n addition, special types of sclerenchyma cells known as fibers, tracheids and vessel elements from important cellular components of the xylem or wood. Sclerenchyma in the form of fibers occurs in the phloem, which like the xylem is a conducting or vascular tissue.