The structure of bast fiber? Md. Saifur Rahman They are very elongated, slender, thick-walled and both the ends of them are pointed, but sometimes may be rounded. In their walls, they have pores called pits. These long cells have arranged an end to end with others. You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?