CLASS 6 COMPONENETS OF FOOD

Transcription

1 CLASS 6 COMPONENETS OF FOOD The major nutrients in our food are CARBOHYDRATES, FATS, PROTEINS, MINERALS, VITAMINS, DIETARY FIBRE (ROUGHAGE), The tests for presence of carbohydrates, and are simpler. Types of carbohydrates in a food item. The main carbohydrates found in our food are in the form of starch and sugars. Test for starch Materials needed: Test tubes, iodine solution, test tube stand, food sample, dropper Method Observation Result Take a small quantity of a food item. Put 2-3 drops of dilute iodine solution on it using a dropper colour of the food item changes to blue-black. A blue-black colour indicates that it contains starch. The tests for presence of proteins Materials needed: Copper sulphate solution, Caustic soda solution, test tubes, dropper

2 Preparing Copper sulphate solution:- dissolve 2 gram (g) of copper sulphate in 100 millilitre (ml) of water. Colour of copper sulphate solution is blue in clolour Preparing caustic soda solution:- dissolve 10 g of caustic soda in 100 ml of water. Chemical name of caustic soda is Sodium hydroxide. Preparing the food sample Take a small quantity of a food item for testing. If the food is a solid, make a paste of it or powder it. Grind or mash a small quantity of the food item. Put some of this in a clean test tube, add 10 drops of water to it and shake the test tube. Method Observation Result using a dropper, add the contents of the two drops of solution of copper sulphate and ten test tube turn drops of solution of violet caustic soda to the test tube containing food sample.shake well and keep the test tube stand for a few minutes. The tests for presence of fats A violet colour indicates presence of proteins in the food item Method Observation Result Take a small quantity of a food item. Wrap it in a piece of paper and crush it. Now, straighten the paper and observe it carefully. Hold the paper against light.. An oily patch is seen. The light is seen faintly, through the patch An oily patch on paper shows that the food item contains fat

3 PICTURE BASED WORK SHEET Observe the pictures and identify/ list energy giving foods Name Task ; Individual Date: Source: Source: Source:

4 ENERGY GIVING FOODS Carbohydrates and fats provide energy to our body. Fats give more energy than same amount of carbohydrates. Foods containing fats and carbohydrates are called energy giving foods PICTURE BASED WORK SHEET Observe the pictures and identify/ list Body Building foods Name Task ; Individual Date: Source: Source:

5 Body building foods Proteins are needed for the growth and repair of our body. Foods containing proteins are called body building foods. PICTURE BASED WORK SHEET Name observe the pictures and make a vitamin chart: Task ; Individual Date: Sources of Vitamin A Sources of Vitamin B Sources of Vitamin C Sources of Vitamin D Types of Vitamins FUNCTIONS OF VITAMINS

6 Vitamins help in protecting our body against. Vitamins also help in keeping our.,, teeth and. healthy. Vitamin B-complex is a..of vitamins. Our body needs all types of vitamins in small quantity / large quantity. We should outside in ground. PICTURE BASED WORK SHEET Name observe the pictures and make a vitamin chart: Task ; Individual Date: List the sources of iodine List the sources of Phosphorous List the sources of iron List the sources of Calcium

7 Date: PARAGRAPH BASED WORK SHEET Name Read the paragraph and answer the questions given below: Task ; Individual Besides these nutrients, our body needs dietary fibres. Dietary fibres are also known as roughage. Roughage is mainly provided by plant products in our foods. Whole grains and pulses, potatoes, fresh fruits and vegetables are main sources of roughage. Roughage does not provide any nutrient to our body, but is an essential component of our food and adds to its bulk. This helps our body get rid of undigested food. What is the other name of dietary fibre? From where do you get roughage; plant source/ animal source? Name five sources of roughage in our diet. Do you get nutrients from roughage? Give two functions of roughage.