Fig. 1 Droplets of water suspended on the tip of leaf blades.
1. The water droplet: Is it the same as dew?
Fig. 3 Guttation on young leaves of a rose.
3. The Process: Is it the same as transpiration?
Transpiration is the process when the water molecules from the roots are lost into the surface of the leaves. Imagine that inside the plant there are tiny capillary tubes, called xylem, that stretch from the roots to the leaves. Then imagine that the tubes are filled with a single line of water molecules starting from right outside the root hair all the way up to the opening of the stomata by way of cohesion (the property of water molecules to attract the same molecules). As the outer-most molecule escapes the stomata into the air, the next molecule takes its position and the rest follow leaving a new vacant position at the tip of the root. So another molecule gets in. It's a cycle that goes on and on. There are two processes involved here: transpiration (exit of water molecule from the stomata) and water absorption (entrance of water molecule into the plant). Depending on the condition of the surrounding environment (temperature, relative humidity, wind velocity, light intensity) these stomata open and close to regulate transpiration. For the plant, transpiration is an on-going process.
Guttation on the other hand is special-occasion process. Certain uncommon conditions have to be met for guttation to occur. Saturated soil and high soil temperature combined with high atmospheric humidity and low air temperature are the optimum conditions for guttation. This is usually happens at night that is why we see the beads of water only in the morning. Guttation happens only in specific plant species. The process is only possible in plants that are equipped with enlarged specialized stomata called hydathodes. I found an excellent picture of hydathodes in action - one can almost feel the movement of water through those openings. The image is very helpful in understanding the process of guttation.
Guttation happens when there is excessive water in the soil and there is an absence of water loss through transpiration.
Guttation is likely to occur during the night, hence the guttation droplets are seen in the mornings.