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2025

Osmosis and osmotic pressure play a very significant role in biological processes.
The osmotic pressure of human blood is 8·21 atm at 27oC. It is interesting to know
that a 0·91% (mass/volume) solution of NaCl, known as saline water is isotonic
with fluids inside the human red blood cells. In this solution, the blood corpuscles
neither swell nor shrink. Therefore, medicines are mixed with saline water before
being injected into the veins.
Answer the following questions.

  1. What is an isotonic solution?
  2. How much glucose should be used per 100ml (aqueous solution) for intravenous injection that is isotonic with blood at 27oC?
  3. What would be the osmotic pressure of blood if the temperature is 37oC?
  4. A pure NaCl solution with salt concentration less than 0·91% (mass/volume) is hypertonic solution to human blood. Is this statement true or false? Give a reason. (e) Name the disease caused by taking a lot of salt or salty food, which results in water retention in tissue cells causing puffiness or swelling. OR

Specimen paper · 2025 · CollegeDekho (mirror of CISCE PDF)

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