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.
1 Sclerenchyma tissues are thick-walled support cells found throughout the plant as fiber. 2  Xylem is a structurally complex tissue that conducts water and nutrients from the roots to all parts of the plant. 3  The xylem is comprised of a series of long tubes made up of shorter vessel members.