NCERT Class 6 Science Chapter 2: Components of Food YouTube Lecture Handouts

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Food – Sources and Ingredients

  • Different food items contain different ingredients

  • Nutrients: Ingredients contain some components that are needed by our body like carbohydrates, fats, proteins, vitamins and minerals.

Image of Components of Food

Image of Components of Food

Image of Components of Food

Food comes from both animal and plant sources.

Image of Sources of fats and source of protetns

Image of Sources of Fats and Source of Protetns

Image of Sources of fats and source of protetns

Nutrients

Image of Food Contains

Image of Food Contains

Image of Food Contains

  • Energy Giving Foods are carbohydrates and fats. Fats give more energy than carbohydrates

  • Protein required for growth and repair of body

  • Vitamins protect body from diseases (A, C, D, E and K). Vitamin B and C are water soluble.

  • Minerals required in small amount for healthy growth.

  • Dietary fiber is roughage. Mainly provided by plants (whole grains, pulses, potatoes). It adds to bulk and helps remove undigested food.

  • Water absorbs nutrients and is removed as sweat and urine

Tests for Starch, Protein and Fats

A. Test for starch

1. Take a test tube and put some crushed potatoes in it.

2. Add few drops of iodine solution in the test tube.

Observation

You will see dark blue black color. This indicates the presence of starch in potato.

B. Test for protein

1. Take a test tube and put some powdered dal in it.

2. Add 2 drops of copper sulphate solution and 10 drops of caustic soda and shake the test tube.

Observation

You will see a violet color. This indicates the presence of proteins in dal.

C. Test for fats

1. Take crushed groundnuts in between the folds of a white paper and press them with the help of thumb.

Observation

You will see a translucent patch on the paper at the place where the nuts were pressed. This indicates the presence of fats (oil).

Balanced Diet

  • Diet that contains good amount of everything including roughage and water is known as balanced diet.

  • This diet varies with age, gender etc. Balanced diet for expecting and lactating mothers are different as compared to normal women.

  • Rich foods when consumed leads to obesity

  • Lack of particular nutrient leads to deficiency

Deficiency Diseases

Diseases that occur due to lack of nutrients over a long period

Image of Protective Food

Image of Protective Food

Image of Protective Food

Values, Handling, Cleaning and Cooking Food

  • MYTH: Expensive and non-vegetarian food has more nutrients

  • Food choices shifting to western items (pizza, burger, garlic bread)

  • Vitamin C is destroyed by cooking

  • Cooked food leads to loss of nutrients

  • The skins of many vegetables and fruits contain vitamins and minerals. Repeated washing removes these.

  • Store food in cold temperature (refrigerator)

  • Wash hands before eating food

Image of Deficiency Disease and Symptoms

Image of Deficiency Disease and Symptoms

Image of Deficiency Disease and Symptoms

Image of Threshing And Winnowing

Image of Threshing and Winnowing

Image of Threshing And Winnowing

Image of Sieving And Hand Picking

Image of Sieving and Hand Picking

Image of Sieving And Hand Picking

Image of Sedimentation

Image of Sedimentation

Image of Sedimentation

Image of Decantation

Image of Decantation

Image of Decantation

Image of Cleaning of Food

Image of Cleaning of Food

Image of Cleaning of Food