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Food Borne Diseases:
If the food handler, like the cook, suffers from some infection and is not careful about washing his hands after defecation, the germs or eggs of worms will reach the food and people will get infected. Typhoid, bacillary dysentery and other stomach infections are. spread in this way. Flies sitting on food always deposit germs there, which they pick up while sitting on excreta or filth. Vegetables and fruits also get contaminated by night soil which is used as fertiliser. Food, which is exposed to flies or even air for long hours is likely to pick up bacteria which easily multiply in it. Such food gets "spoiled and could be a potent source of disease. In its strongest form it is called food poisoning. The common symptoms are abdominal cramps, nausea, vomiting. and diarrhoea. Generally bacteria are killed in heated food. but toxins produced by them are heat resistant.
Evaporation in a mist of little drops is sometimes used to cool hot, dry air. Let Consider the Temperature in a spherical drop of liquid that is evaporating slowly enough that its
#2 DESCRIBE THE APPEARANCE OF THE STOMATE AND THE GUARD CELLS.
solar system At night you can see very many stars in the sky. But during the day, only one star is .visible, and that is the Sun. This is not because there is anything extrao
Define the term - Soil protozoa These are unicellular but larger than bacteria, the size varying from a few microns to a few centimeters. The protozoa exist in all aerable soil
Define the Absorption of Amino Acid Proteins are absorbed in the form of amino acids. Amino acid transport occurs 'only in the presence of simultaneous sodium transport. Carrie
Fortin type barometer A simple Fortin type barometer can be improvised for the junior laboratory. The glass tube is held vertically with single end in the reservoir by two curt
Ascorbic Acid (vitamin C) Although the antiscorbptic (preventing the disease scurvy) effects of citrus hits was known for a long time, the first important step towards its
Another way to show that air expands when heated Snap a toy balloon over the neck of a small bottle and place the bottle in a pan of warm water.
Let us recall briefly what all we have learnt about fire hazards in this unit. Fire accident can happen due .to a number of reasons, like, flammable liquids, faulty electrical and
What are the Disadvantages of Alkaline Soils As most of the plants can assimilate nitrogen in its nitrate form, and oxidation of ammonium fertilizer can take place only in acid
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