| Transpiration | Guttation |
| It is a process by which plants exhale water vapour through the stomata. | It is a process of secretion of water droplets from the pores of vascular plants such as grass. |
| Transpiration occurs through stomata and lenticels. | Guttation occurs through Hydathodes, which are commonly found in angiosperms. |
| In this process, only pure water is evaporated. | It eliminates amino acids, salts, and sugars. |
| It is favoured by dry conditions. | It is resisted by dry conditions. |
| Water is lost as water vapours. | Water is lost as liquid. |
| In this process, root pressure is not involved. | In this process, root pressure plays an important role. |
| Transpiration occurs during the day. | Guttation occurs during the early morning or at night. |
| Transpiration occurs in terrestrial and herbaceous plants. | Guttation only occurs in herbaceous plants. |
| Excessive transpiration results in wilting i.e loss of rigidity of non-woody plants. | It never results in wilting. |
| It takes place at a high temperature. | It takes place at a low temperature. |
| Transpiration rate is reduced during humid days. | Humidity increases the rate of Guttation. |
| Water is lost through simple diffusion in the Transpiration process. | Water that is lost in guttation is not through diffusion. |
| Transpiration can be checked by opening or closing of the stomata. | It can not be regulated as hydathodes do not open or close. |