Explain in detail the structures of components that help in locomotion of unicellular organisms.

1. Cilium or flagellum helps in locomotion of unicellular organisms. 

2. They consist of basal body, basal plate and shaft. 

3. Basal body is placed in outer part of cytoplasm. It is derived from centriole. It has nine peripheral triplets of fibrils. 

4. Shaft is exposed part of cilia or flagella. It consists of two parts- sheath and axoneme. 

5. Sheath is covering membrane of cilium or flagellum. 

6. Core called axoneme possesses 11 fibrils (microtubules) running parallel to long axis. 

7. It shows 9 peripheral doublet microtubules and two single central microtubules (9+2). 

8. The central tubules are enclosed by central sheath. 

9. This sheath is connected to one of the tubules of peripheral doublets by a radial spoke. 

10. Central tubules are connected to each other by bridges. 

11. The peripheral doublet microtubules are connected to each other through linkers or inter-doublet bridge.