Question

loss of small quantities of liquid water through pores is called ...??..

Answer 1

Loss of small quantities of liquid water through pores is called Transpiration or
Loss of Water-Guttation.

Answer 2

Inspite of water being an essential component of plant cells, instead of conserving, they lose water from their surfaces.  By doing so they themselves get into peril, but they also benefit by this process.  By the quirk of nature, plants have no control over the loss of water, because it is the environmental factors that force the plant to loose water in the form of water vapors or sometimes in liquid form.  Nonetheless, many plants belonging to various taxons are adopted to check excessive loss of water and also conserve water.  The process by which plants loose water in liquid form is called Guttation; on the other hand, if the water is lost from the plant body in the form of water vapors, then the phenomenon is called Transpiration, which is often referred to as an unavoidable evil process.

 

Guttation:

 

Plants which loose water by guttation are restricted to few taxons in the plant kingdom; hardly there are 150 – 250 plant species – ex. Tomato, grasses, colochasia, cucurbita members, balsam, etc.  Colochasia, an aquatic plant has been found to loose more than 250 ml of water per day.  Otherwise, the amount of water lost by guttation is hardly of any significance.  Unlike transpiration process, guttation takes place only under certain conditions like high relative humidity in the atmosphere and plants with high amount of  water in the soil.