To test the presence of water in different food items and paste any five pictures of water rich food
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Hint: (Take 50g of each of Rajma seeds, coriander leaves and potato slices, in separate plates. Expose them
to sunlight for 4 days and observe.)
a) Mention the food samples ha Bing less water
b) Is there any advantage of having less water content in food items? (Think and write)
c) Identify the various food items rich in water.
Which of them is/are a part of your daily diet.
Write it down on sheets.
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Explanation:
Objective
This topic gives you an overview of;
Contents in Different Food items
Test for starch
Test for proteins
Test for Fats
What do Different Food Items Contain?
We know that each dish is usually made up of one or more ingredients, which we get from plants or animals. These ingredients contain some components that are needed by our body. These components are called nutrients. Different food items contain different types of nutrients. Carbohydrates, proteins, fats, vitamins and minerals are important nutrients found in food.
For carrying out these tests, you will need solutions of iodine, copper sulphate and caustic soda. You will also need a few test tubes and a dropper.
Test for Starch
There are many types of carbohydrates. The main carbohydrates found in our food are in the form of starch and sugars. We can easily test if a food item contains starch.
Take small quantity of the food items to be tested.
Put 2-3 drops of iodine solution on it.
Observe the colour of the food item.
Blue-black colour indicates the presence of starch in the tested food item.
Test for Protein
Proteins are needed for the growth and repair of our body. Foods containing proteins are often called ‘Body Building Foods’. Test if a food item contains protein.
Take a small quantity of the food items to be tested.
Grind/mash/paste/powder the food item.
Put the food item into a test tube.
Add 10 drops of water and shake the test tube.
Using a dropper add two drops of copper sulphate solution to the test tube.
Add 10 drops of caustic soda solution and shake the test tube.
Observe the colour of the mixture.
Violet colour indicates the presence of proteins in the tested food item.
Test for Fats
Fat is a major source of energy and also aids your body in absorbing fat soluble vitamins. You need a minimum of 10 to 20 percent of your overall calories as fat .Test if a food item contains fat.
Take a small quantity of the food item to be tested.
Wrap the food item in a piece of paper and crush it.
Straighten the paper.
Dry the paper by keeping it in sunlight for a while.
Observe the paper.
An oily patch on the paper indicates the presence of fats in the tested food item.
Summary
Nutrients are chemical components in food that are required for releasing energy and helps in growth. Carbohydrates and fats mainly provide energy to our body.
The major nutrients in our food are carbohydrates, proteins, fats, vitamins and minerals. In addition, food also contains dietary fibres and water.
Proteins and minerals are needed for the growth and the maintenance of our body.
Starch and sugar are the two kinds of carbohydrates found in food.
Carbohydrates and fats mainly provide energy.
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A. Among the given option there is lesser amount of water present in the Rajma seed.
B. There is no advantage of having less water content in the food. If there is high amount of water in the food then it prevents constipation and makes the body dehydrated which prevents lot of harmful effects on the body.
C. Thirdly the food item that is rich in water is potato slice and coriander leaf
To know more,
1) Name the chemicals used to test for protein in food. - Brainly.in
brainly.in/question/21475835
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