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Iodised salt is useful because it
1. improves digestion
2. increases resistance to diseases
3. controls the thyroid gland
4. All of the above

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Correct Answer - Option 4 : All of the above

The correct answer is All of the above.

  • Iodised salt is useful because it improves digestion.
  • Iodised salt is table salt assorted with a minute amount of various salts of the element iodine.
  • The ingestion of iodine intercepts iodine deficiency.
  • Iodine deficiency is globally influencing about two billion people and is the leading restrainable cause of intellectual and developmental disabilities.
  • Deficiency even causes thyroid gland problems, including "endemic goitre".
  • In many countries, iodine deficiency is causing serious public health threat that can be cheaply addressed by purposely adding small amounts of iodine to the sodium chloride salt.

  • Iodine is a micronutrient and dietary mineral that is naturally present in the food supply in some regions, specifically present near sea coasts but is generally quite rare in the Earth's crust since iodine is a so-called heavy element.
  • The profusion of chemical elements generally declines with greater atomic mass.

  • Where natural levels of iodine in the soil are inferior and the iodine is not taken as needed up by vegetables, iodine added to salt bestows the small but essential amount of iodine needed by humans.
  • An opened package of table salt with iodide may rapidly lose its iodine content in high temperature and high relative humidity conditions through the procedure of oxidation and iodine sublimation.

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