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Components of Food Test - 10

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Components of Food Test - 10
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  • Question 1
    1 / -0
    Foods containing __________ are also called energy-giving foods.
    Solution
    Carbohydrates and fats are great sources of energy. Therefore, foods containing carbohydrates and fats are also called energy-giving foods. Foods containing proteins are called body-building foods as proteins are needed for the growth and repair of our body.
    Therefore, the correct answer is option D.
  • Question 2
    1 / -0
    To keep people healthy, strong, energetic and long-lived, it is necessary to provide them with
    Solution
    For a healthy living, we require a balanced diet. A balanced diet is one which contains correct proportion of carbohydrates, fats and proteins. It should provide us with necessary minerals and vitamins. Roughage or fiber is also an important part of balanced diet. The proper diet should be taken along with proper water intake for a healthy living.
  • Question 3
    1 / -0
    To get ample supply of carbohydrates, one should eat:
    Solution
    Carbohydrates provide us with energy and are the primary cellular fuel. Carbohydrates can be simple sugars or polymers like cellulose and starch. Cereal grains like rice, wheat, maize etc. are rich in carbohydrates.
    So, the correct answer is option D.
  • Question 4
    1 / -0
    Iodine gives blue-black colour with
    Solution
    • The iodine test is used for the determination of the presence of starch in a sample. 
    • Molecular iodine is not soluble in water and hence potassium iodide is added to it. 
    • Together they form a polyiodide complex which upon addition of starch turns intense blue-black colour. 
    • Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue colour of the reaction. 
    • In the absence of starch solution remain as light brown colour which is the colour of iodine solution.

  • Question 5
    1 / -0
    Balanced diet should have approximately:
    Solution
    • We should eat a balanced diet for healthy living. A balanced diet is a diet that contains all the components in optimum proportions and quantity required for maintaining the body in a perfect state of health, activity, and development. 
    • Various components of a balanced diet are carbohydrates (60 per cent), fats (20 per cent), proteins (20 per cent), vitamins (traces), minerals (traces) and roughage or fibre.
      So, option C is correct.
  • Question 6
    1 / -0
    Meat, milk and eggs mainly supply us with:
    Solution
    Proteins are the major body-building biomolecules. Proteins serve a variety of structural and functional roles in the body. Meat, milk, and eggs are important animal sources of proteins. Soyabean and other pulses are an important source of plant proteins.
    So, the correct answer is option C.
  • Question 7
    1 / -0
    A person is eating rice mostly for his meals. His food is rich in: 
    Solution
    Cereals like wheat, rice, maize, etc. are good sources of carbohydrates. They contain starch as reserve food. Starch is a polymer of glucose.
    So, the correct answer is option B. 
  • Question 8
    1 / -0
    A few drops of iodine solution were added to rice water. The solution turned blue-black in color. This indicates that rice water contains
    Solution
    Hint: Iodine solution is used as a confirmatory test in the detection of a certain polysaccharide.

    Part 1 - Composition of rice water
    • Rice grains contain 75–80 percent starch.
    • The starchy water left over after rice is cooked or left to soak is rice water.
    • Apart from starch, rice water also contains amino acids, fats, minerals, proteins, and vitamins etc. 
    • Starch is a type of polysaccharide found mainly in plant and plant products.

    Part 2 - Reaction of Iodine with starch
    • A solution of iodine and potassium is added to a starch-containing substance instead of molecular iodine because molecular iodine is not soluble in water.
    • Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue color of the reaction. 
    • The reaction proceeds as follows:-
            $$I_2$$ + $$I^-$$  $$→$$    $$I_3^-$$- + starch (dark blue colour)
    • In the absence of starch solution, remains as light brown color which is the color of iodine solution.

    Part 3 - Conclusion
    • From the above discussion, we can conclude that if a few drops of iodine solution were added to rice water, the resultant blue-black color is because of the presence of starch in rice water.

    Final step -  Iodine will give a characteristic blue-black color in the presence of starch.
  • Question 9
    1 / -0
    Which of the following has maximum proteins?
    Solution
    Rice and Wheat are cereals belonging to Family Poaceae. They are rich in carbohydrates. Gram and Soybean are legumes of Family Leguminosae. Legumes are rich in proteins. Soyabean is also an important oilseed crop. Among legumes Soyabean are richest source of proteins. Together, soyabean oil and protein content account for about 60% of dry soyabeans by weight (protein at 40% and oil at 20%).
  • Question 10
    1 / -0
    Scurvy is a disease caused by 
    Solution
    • Scurvy is a disease caused by severe and chronic vitamin C (ascorbic acid) deficiency. 
    • Symptoms include feeling generally unwell and bleeding gums. Babies and young children can suffer complications from scurvy including stunted bone growth. Good dietary sources of vitamin C include citrus fruits and green vegetables.
      Hence, correct option is C.
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