Stomata of CAM plants:
| 1. | Are always open |
| 2. | Open during the day and close at night |
| 3. | Open during the night and close during the day |
| 4. | Never open |
Plants adapted to low light intensity have:
| 1. | Higher rate of CO2 fixation than the sun plants |
| 2. | More extended root system |
| 3. | Leaves modified to spines |
| 4. | Larger photosynthetic unit size than the sun plants |