UPTAKE OF WATER AND SALT BY PLANTS
You have learnt earlier that plants survive if water, minerals ans others nutrients are provided to them. In this lesson, we will learn how these substances enter the plant cell. To understand this we have to understand the terms diffusion and ‘osmosis’ and the processes associated with them.
We will do a simple experiment to understand the process of diffusion. Take a beaker full of water and carefully add two or three crystals of copper sulphate or potassium permanganate.
When the permanganate crystal settles at the bottom of the beaker, a small amount of water comes in contact with the surface of crystal. This water dissolves permanganate and results in the formation of a concentrated solution of the salt at the point.
1. All the molecules in a solution are in a state of continuous motion.
2. They move randomly in all the directions.
3. Molecules move from higher concentration to lower concentration.
4. this movement from higher to lower
concentration occurs till the concentration
becomes equal at both the points..
The process of movement of molecules or ions from appoint of high concentration to a point of low concentration till the concentration at both the points become equal is called diffusion.
We have not supplied and additional energy for the movement of the molecules. The energy required for the movement of molecules comes from the kinetic energy of the molecules its self. The process of diffusion occurs nor only in water but also in air.
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