If 0.9gm of NaCl is dissolved in 100ml of water, it is a _ solution.
Correct answer: B. Hypotonic
- A. Hypertonic
- B. Hypotonic
- C. Isotonic
- D. None of them
Explanation
The solution described (0.9gm of NaCl in 100ml of water) equates to a 0.9% NaCl solution, which is hypotonic relative to physiological conditions (where isotonic solutions are typically around 0.9% NaCl). Therefore, this solution would cause cells to swell as water moves into them. Option A is incorrect because a hypertonic solution has a higher solute concentration, causing cells to shrink. Option C is incorrect because an isotonic solution would have no net water movement. Option D is incorrect as the solution is indeed hypotonic.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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