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
What does ecological niche of an organism represent? Mention the scientific term used for modified form of reproduction in which seeds are produced without fusion of gametes.

The initial velocity of  an  enzyme catalyzed reaction The mathematical relationship between  the initial velocity of  an  enzyme catalyzed reaction, the concentration of the s

Explain about the Solar Dryers? There are so many different designs for solar dryers, these range from simple convection dryers, cabinet dryers, shelf dryers to more complicate

3 benefits humans get from coral

REFLE X ACTION - Marshel Hall discovered reflex action. Best & Taylor defined it. Reflex action is functional unit of CNS. It is sudden, immediate involuntary acti

Q. Explain about Food Exchange System? In a diabetic's day to day diet, the calorie intake and the quantity of food consumed should not have wide fluctuations. Also the diet sh

Explain about the Bifidogenic Effect? Fructans selectively stimulate the growth of Bifidobacteria and Lactobacilli, while decreasing concentrations of E.coli, Clostridia and ba

Define Precautions for Check the Presence of Rhodamine B? 1. Sample should be clean and dry. 2. Dispose off the paraffin oil carefully, so that it does not contaminate food/

For measuring the rate of transpiration of a twig using Ganong's potometer, learner A cuts the twig and fits it in the broad end of the water-filled potometer. Learner B cuts the t

Q. What is the relationship between concentration gradient and passive and active transport? Passive transport is the movement of substances across membranes in favour of their