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Tuesday, August 2, 2011

Answers of Science Class VI Test -1 From Chapter 2 – Components of Food

M.M: 57 marks                                                  Dated: 01/08/2011
Time: 1 hour
A 1: Fill in the blanks (1 mark per question x 18 = 18 marks)
  1. Nutrients are the ingredients that contain some component needed by our body.
  2. The major nutrients in our food are carbohydrates, proteins, fats, vitamins and minerals.
  3. The main carbohydrates found in our food are the form of starch and sugars.
  4. While doing test for starch in a food item or raw ingredient, 2-3 drops of iodine solution is put in the item being tested.
  5. When test for starch in a food item is done, the blue-black colour is obtained.
  6. While doing test for fats in a food item, an oily patch on paper shows that the food item contains fat.
  7. The white portion of boiled egg will have proteins in it.
  8. Milk will have proteins and fats in it.
  9. Carbohydrates mainly provide energy to our body.
  10. Proteins are needed for the growth and repair of our body.
  11. Vitamins help in protecting our body against diseases.
  12. Names of two common vitamins are vitamin A and vitamin C.
  13. Vitamin A keeps our skin and eyes healthy.
  14. Mango, Papaya, Carrot, and Liver are rich in vitamin A.
  15. Lemon, Amla, Guava and Orange are rich in vitamin C.
  16. Rice is a carbohydrate rich source of food.
  17. Lack of vitamin A can cause loss of vision.
  18. Diseases that occur due to lack of nutrients over a long period are called deficiency diseases.
Q 2: In brief, write how will you do a test for protein in a food item? (3 marks)
A 2: Take a small quantity of a food item for testing. If the food item is a solid then make a paste of it by mashing it or powder it by grinding.
Take a clean glass test tube, add ten drops of water to the food item in the test tube and shake the test tube. Using a dropper, add two drops of solution of copper sulphate and ten drops of solution of caustic soda to the test tube.
Shake well and let the test tube content stand for a few minutes. A violet colour will indicate the presence of protein in the food item.
Q 3: Write two nutrients that provide us energy.                   (2 marks)
A 3: Fats and carbohydrates provide us energy.
Q 4: Foods containing which nutrient are called body building foods? (1 mark)
A 4: Foods containing proteins are called body building foods.
Q 5: What helps in keeping our eyes, bones, teeth and gums healthy?                                                                                   (1 mark)
A 5: Vitamins help in keeping our eyes, bones, teeth and gums healthy.
Q 6: Which vitamin helps our body to use calcium for bones and teeth?                                                                                        (1 mark)
A 6: Vitamin D helps our body to use calcium for bones and teeth.
Q 7: Write four sources of vitamin D.                                  (2 marks)
A 7: Four sources of vitamin D are milk, butter, eggs and fish.
Other sources of vitamin D are Cereals, Cod liver oil, Mushrooms and Cheese. Natural source of vitamin D is Sunlight.
Q 8: Write four sources of vitamin B.                                   (2 marks)
A 8: Four sources of vitamin B are liver, bananas, potatoes and green vegetables.
Other sources of vitamin B are eggs, dairy products, meat and liver.
Q 9: What do you understand by roughage? What is its use in our body? Which products in our foods provide roughage?         (3 marks)
A 9: Roughage is dietary fibres. Roughage does not provide any nutrient to our body but is an essential component of our food as it helps in getting rid of undigested food in our body.
Q 10: In the given table, fill two sources of each of the minerals
(4 marks)
A 10:
Sources of iodine
Garlic, Mushroom. Others are: Seafood, Soya beans, Spinach and Turnip.
Sources of phosphorus
Peanuts, Oats. Others are: barley, Raw cashew nuts, Sesame seeds and Black beans.
Sources of iron
Cooked spinach, green soya beans. Others are: Sorghum, coconut milk, raw cashew nuts and oats.
Sources of calcium
Green turnip and cooked spinach. Others are orange juice, soya milk.
Q 11: What are the two purpose of water in human body? (2 marks)
A 11: The two purpose of water in human body are:
  1. It helps our body to easily absorb nutrients from food.
  2. It helps in throwing out some wastes from our body through urine and sweat.
Q 12: Define balanced diet.                                               (1 mark)
A 12: A balanced diet is a diet that has all the necessary nutrients needed by our body in right amount along with adequate quantity of water and roughage also.
Q 13: In the given table, complete the disorder column by filling the name of disorder and symptom column by filling one symptom for the corresponding lack of given vitamins/minerals.                  (4 marks)
A 13:
Deficiency of vitamin/mineral
Name of disorder
Bone and tooth decay
Weak bones, tooth decay.
Vitamin D
Bones become soft and bent.
Vitamin C
Bleeding gums, wound takes longer to heal.
Q 14: Deficiency of vitamin B1 causes which disorder and what are its two symptoms?                                                                  (3 marks)
A 14: Deficiency of vitamin B1 causes Beriberi. The symptoms of Beriberi are:
  1. Weak muscles
  2. Very little energy available for work.
Q 15: Lack of iodine causes which disease and what are its two symptoms?                                                                            (3 marks)
A 15: Lack of iodine causes Goiter or Goitre. Two symptoms of Goiter or Goitre are:
  1. Glands in the neck appear swollen
  2. Mental disability happens in children.
Q 16: What are the two symptoms of loss of vision disorder? 
(2 marks)
A 16: The two symptoms of loss of vision disorder are:
  1. Poor vision
  2. Loss of vision in night or darkness.
Q 17: Write True or False, Correct false statements wherever relevant.                                                          (1 mark x 5 = 5 marks)
A 17:
  1. Chips are good source of dietary fibre – False (Chips are junk food so they are not source of dietary fibre).
  1. Only some of the deficiency diseases can be prevented by taking a balanced diet – False (All deficiency diseases can be prevented by taking a balanced diet).
  1. Obesity means being too much thin – False (Obesity means being too fat).
  1. Vitamins and minerals are there on skins of many vegetables and minerals – True.
  1. Cooking results in loss of certain nutrients – True.

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