Phellogen and phellem respectively denote
| 1. | cork and cork cambium |
| 2. | cork cambium and cork |
| 3. | secondary cortex and cork |
| 4. | cork and secondary cortex |
Which one of the following cell types always divide by anticlinal cell division?
1. Fusiform initial cells
2. Root cap
3. Protoderm
4. Phellogen