1. | Guard cells invariably possess chloroplasts and mitochondria |
2. | Guard cells are always surrounded by subsidiary cells |
3. | Stomata are involved in gaseous exchange |
4. | Inner walls of guard cells are thick |
1. | Parenchyma | 2. | Collenchyma |
3. | Sclerenchyma | 4. | Sclereid |
1. | Epiblema | 2. | Cortex |
3. | Endodermis | 4. | Pericycle |