| 1. | cells that mature into secondary xylem towards pith and into secondary phloem towards periphery |
| 2. | cells that mature into secondary xylem towards periphery and into secondary phloem towards pith |
| 3. | cells that mature into primary xylem towards pith and into primary phloem towards periphery |
| 4. | cells that mature into primary xylem towards periphery and into primary phloem towards pith |
| 1. pith meristem | 2. cork cambium |
| 3. cortex cambium | 4. vascular cambium |
| 1. | outer cells differentiate into cork or phelloderm and inner cells differentiate into secondary cortex or phellem |
| 2. | inner cells differentiate into cork or phelloderm and outer cells differentiate into secondary cortex or phellem |
| 3. | outer cells differentiate into cork or phellem and inner cells differentiate into secondary cortex or phelloderm |
| 4. | inner cells differentiate into cork or phellem and outer cells differentiate into secondary cortex or phelloderm |
| 1. | Cork | 2. | Secondary phloem |
| 3. | Secondary cortex | 4. | Vascular cambium |