Stomata - water loss, Biology

Stomata - Water Loss

The cross-section of a leaf shown in Figure shows the position of a typical stoma (plural stomata) which however, differs from species to species, with respect to the size of the pore, structure and size of the guard cells and depth and size of the stomatal cavity. As indicated in the diagram b, water evaporates from wet mesophyll cell walls that border intercellular spaces, the vapours then diffuse out through sub-stomatal cavity and stomatal pores to the air outside the leaf.

1601_Stomata - Water Loss.png

The water potential gradient develops in the sub-stomatal cavity, stomatal pore, boundary layer and the atmosphere. During transpiration the sub-stomatal cavity has relatively much higher water potential as compared to the atmosphere, therefore, the water vapours move out. This is turn lowers the water potential of the sub-stomatal cavity. Consequently, the cells surrounding the sub-stomatal cavity evaporate water through their cell walls. Depending upon the water potential of the environment, the water potential of the sub-stomatal cavity and the surrounding cells is lowered. This gradient eventually acts as a 'pull' on the water column which maintains continuity through the vascular bundles of the leaf. The intercellular spaces also play an important role in this respect because they are in continuity with the sub-stomatal cavity and cause a gradient quickly.

Posted Date: 1/17/2013 1:58:28 AM | Location : United States







Related Discussions:- Stomata - water loss, Assignment Help, Ask Question on Stomata - water loss, Get Answer, Expert's Help, Stomata - water loss Discussions

Write discussion on Stomata - water loss
Your posts are moderated
Related Questions
ciclo vital de la isospora belli

Describe Respiratory System? The respiratory system is responsible for the transport of oxygen and carbon dioxide from outside the body to and from the blood. This process is c

Q. Which are the subproducts of the photochemical phase that are essential for the chemical stage of photosynthesis? The chemical stage of photosynthesis depends on ATP and NAD

What is Specific defence mechanism Specific:  These relate to specialized cells located throughout the  body which respond to invasion of foreign materials/microorganisms  su

Q. Relationship between Mind and Brain? In modern times, before the 20th century, the most popular interpretation of the mind-brain relationship was some version of dualism. It

Chemical Composition and Nutritive Values The nutritional quality of an oil meal protein will be affected by the processing conditions to which it is been exposed. Three major

Define Eosin - Methylene Blue (EMB) Agar (Levine) Peptone - 10.0 gm Lactose - 5.0 gm Dipotassium - 2.0 gm Hydrogen Phosphate Agar - 13.5 gm Eosin Y - 0.4 gm M

Subdivisions of Ecology Ecology was earlier divided into plant and animal ecology. However, modem ecology does not make any such distinction since plants and animals are intima

Production of Industrial Compounds Cultured plant cells retain their metabolic potential and synthesise secondary products of commerce. Cell cultures can also be used as facto

why is blood called a fluid connective tissue ?