DEFINITIONS AND KEY- POINTS FOR OBJECTIVES OF DIFFUSION, OSMOSIS, ABSORPTION

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TERMS	.. .
TERMS	DEFINITIONS
Diffusion	The movement of molecules from higher – concentrationto lowerconcentrationis called
Chemical potential .	The total kinetic energy of the molecules is called chemical potential.•
Graham’s law	It states thatthe rates of diffusionof gases ai. inverselyproportional to the square roots of the .r densities.
Diffusion pressure	The pressure exerted by the diffusing particles is known as diffusion pressure.
Imbibition	The special type of diffusion in which an imbibant absorbs water on its surface without dissolving in it is called imbibition.
Imbibition pressure	The force generatedby theimbibantsis called imbibition pressure or metric potential.
Osmosis	The movement of solvent molecules front the regiQn
	of higher concentration to the region of lower concentration through semi permeable membrane is called osmosis.
Osmotic pressure	The maximum pressure that develops when a solution is separated from its solvent by a semi permeable membrane is called osmotic pressure.
Water potential	The chemical potential of water is called water potential. The total kinetic energy of the molecules is called water potential.
Solute potential :-.	The decrease in water potential due to dissolution of solute molecules or ions in water is called solute . .
Matric potential	The decrease in the water potential due to affinity of water molecules with the colloidal substances (protoplasm and cell wall) is called matric potential.
Pressure potential	The turcor pressure (TP) exerted by the vacuole is called pressure potential.
Soil	[he complex composite mass made up of both inorganic and organic. components containing water and air is called soil.
Soil texture	Relative proportion of the soil particles size is known as soil texture.
Run away water	Some of the water drains away along the slopes after a lieu\ v rainfall. or irrigation. This is called run-a um u ater.
Field capacity of soil	.1-he amount of 11 at e r retained by soil after the ---------------------------- ---------------------------- removal of excess water by gravitation is called ths. field capacity or the water holding capacity of the soil.
Ilygroscopic water_ .	Water adsorbed on the surface of soil colloids is called hygroscopic water.
Capillary water	The ‘sater which fills the spaces between the non colloidal smallersoil particles is called capillary water.
Water table	The water level at some depth from the soil where all pore spaces are filled with water is called Water table.
Wilting coefficient	The amount. of moisture left in the soil after a plant has permanently wilt is called wilting coefficient.
Apoplast pathway	The movement of water molecules through the adjacent cell walls is called apoplast pathway.
Symplast pathway	The movement of water through the protoplast of the plant cells is called symplast pathway.
Root pressure	The hydrostatic pressure generated in the root which forces the water upward in the stem is called root pressure.
Capillary tube	A glass tube with a narrow bore is called a capillary tube.
Cohesion tension theory	This theory states that the negative pressure or pull or suction is created in the leaves as a result of transpiration pulls the water upward.
Adhesion	The attraction between the water molecules and the cell wall of the xylem cells is called adhesion.
Transpiration	The evaporation of water from the aerial part of plant is called transpiration.
Saturation deficit	Saturation deficit is the difference between the amount of water vapour actually present in the air and the amount necessary to completely saturate it.
Absolute humidity	The amount of moisture actually present in the air is called its absolute humidity
Relative humidity	The percentage of the amount of moisture necessary for saturation at a particular temperature is called relative humidity.

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