The correct answer is: B. Character of semi permeable membrane is not given.
A semipermeable membrane is a membrane that allows certain molecules or ions to pass through it while blocking others. The movement of molecules or ions through a semipermeable membrane is called osmosis.
In the statement “Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane,” the character of the semipermeable membrane is not given. It is not known what type of molecules or ions are able to pass through the membrane, or what the size of the pores in the membrane is. This information is important because it affects the rate of osmosis.
For example, if the membrane is only permeable to water molecules, then the rate of osmosis will be much slower than if the membrane is permeable to both water molecules and small ions. This is because water molecules are much smaller than most ions, so they can pass through the pores in the membrane more easily.
The size of the pores in the membrane also affects the rate of osmosis. If the pores are very small, then only small molecules or ions will be able to pass through the membrane. This will slow down the rate of osmosis.
In conclusion, the correct answer is: B. Character of semi permeable membrane is not given.