Regarding the guard cells:
| 1. | walls away from the stomatal pores are thin and those towards the stomatal pores are thick |
| 2. | walls away from the stomatal pores are thick and those towards the stomatal pores are thin |
| 3. | chloroplasts are mostly absent |
| 4. | play no role in the regulation of opening and closing of stomata |
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
1. Tyloses in vessels
2. Closure of stomata
3. Flaccidity of bulliform cells
4. Shrinkage of air spaces in spongy mesophyll