Transpiration is the loss of water from a plant in the form of water vapor. absorbed by roots from the soil and transported as a liquid to the leaves via xylem. leaves, small pores allow water to escape as a vapor. less than 5% remains in the plant for growth.
The largest number that has a commonly-known specific name is a googleplex, which is a 1 followed by a googol zeros, where a googol is (a 1 followed by 100 zeros).
There is no largest number (a real number) in the world (and I take it you aren't talking about complex numbers, because given two complex numbers z and w, you can't make sense of z>=w). For suppose that there was a world's largest number, and let it be denoted by k. Then, consider k+1.