(a) Guttation: The loss of water in the form of droplets from the margins of leaves is called guttation. The process of guttation can be seen in the leaves of colocasia, tomato, potato, grass etc., morning time. In thin plants, small pores are found on margins of leaves which are called hydathodes. They have epithem cells which receive water from xylem and release water outside in the form of small droplets.
(b) Secretion: If an incision or wound is made in a stem, leaves or other part of plant, the latex oozes out, it is called secretion. In palm plant it occurs from phloem. In Nerium, mango tree it occurs in the form of latex.
