| 1. | they are certain adaxial epidermal cells that when flaccid make the leaves curl inwards |
| 2. | they are certain abaxial epidermal cells that when flaccid make the leaves curl inwards |
| 3. | they are certain adaxial epidermal cells that when turgid make the leaves curl inwards |
| 4. | they are certain abaxial epidermal cells that when turgid make the leaves curl inwards |
| 1. | wide variations in size of vascular bundles in the main veins |
| 2. | wide variations in size of vascular bundles except in the main veins |
| 3. | near similar size of vascular bundles in the main veins |
| 4. | near similar size of vascular bundles except in the main veins |