The microbial diseases that can spread from an infected person to a healthy person by some agents like air, water, food or physical contact are called communicable diseases.
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What do you mean by communicable diseases?
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Give reasons for the following. (i) Fresh milk is boiled before consumption while processed milk stored in packets can be consumed without boiling. (ii) Raw vegetables and fruits are kept in refrigerators whereas jams and pickles can be kept outside. (iii) Farmers prefer to grow beans and peas in nitrogen deficient soils. (iv) Mosquitoes can be controlled by preventing stagnation of water though they do not live in water.
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