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प्रश्न
Discuss biological and industrial importance of osmosis.
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उत्तर
Some essential importance of osmosis are given below:
• In animals, circulation of water to all parts of body takes place due to osmosis.
• Plant roots absorb water from soil due to osmosis. Concentration of cell sap inside the root hair cells is higher than that of water present in the soil. Water enters the root cells due to endosmosis.
• Water absorbed by plant roots is circulated in the entire plant body and reaches to the top of a tall tree due to osmosis.
• Osmosis helps in plant growth and germination of seeds.
• Red blood cells burst when placed in water; it is due to endosmosis.
• Various functions of plants are controlled by osmosis, e.g., stretching of leaves and flowers, opening and closing of flowers.
• Use of salt and sugar in‘pickles and jams acts as preservatives. It prevents growth of bacteria and fungi by osmosis.
• Dead bodies swell under water due to endosmosis.
• When dried fruits and vegetables are placed in water, they slowly swell and return to the original form. It is again due to endosmosis of water into the fruits and vegetables.
• Edema: Due to excess intake of salt by a person, the tissues become puffy, it is called edema. It is due to retention of water in the tissue owing to osmosis.
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संबंधित प्रश्न
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C.
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Define osmotic pressure.
Calculate the mass of NaCl (molar mass = 58.5 g mol−1) to be dissolved in 37.2 g of water to lower the freezing point by 2°C, assuming that NaCl undergoes complete dissociation. (Kf for water = 1.86 K kg mol−1)
Define the following term:
isotonic solution
Answer the following.
How molar mass of a solute is determined by osmotic pressure measurement?
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Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called ____________.
At constant temperature the osmotic pressure of a solution is ____________.
Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be:
The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic pressure of 16.4 atoms is: (R = 0.082 L atom K−1 mol−1)
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How can you remove the hard calcium carbonate layer of the egg without damaging its semiprermiable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.
Isotonic solutions are the solutions having the same ______.
Prove that: M2 = `(W_2RT)/(πV)`.
Name the four colligative properties that are oftently used for determination of molecular mass.
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