| 1. | Adaptability to dry tropical regions |
| 2. | Greater productivity of biomass |
| 3. | Presence of photorespiration |
| 4. | Response towards high light intensities. |
| 1. | Randomly to either CO2 or O2 |
| 2. | To CO2 |
| 3. | To O2 |
| 4. | Neither to CO2 nor O2 |
| 1. | In case of high light intensity |
| 2. | In case of low temperature |
| 3. | In case of plants in dense forests |
| 4. | In case of water scarcity |
| 1. | Higher CO2 concentration should be given |
| 2. | Lower CO2 concentration should be given |
| 3. | No CO2 concentration should be given |
| 4. | CO2 concentration needs no modification |