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प्रश्न
Explain any two chemical methods of food preservation.
Describe ‘any two’ chemical methods of food preservation.
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उत्तर
Chemical methods used to preserve food:
a) Addition of sugar: In this method, sugar is added and then food is heated. This method
is used for the preparation of jams, jellies and marmalades. Fruits like apples, mangoes,
strawberries, carrots, etc are preserved by this method
b) Addition of salt: Common salt has antimicrobial activity. Salt is added to food to
control the growth of fungus and micro-organisms. When salt is added, bacterial
cell loses water due to osmosis. Due to this, the cell either remains dormant or dies.
This helps in storage of food. This method of preservation of food by addition of
salt is called salting. It is used for preservation of fish products, meat and for the
preparation of pickles of lemon, chillies, raw mangoes, etc. It is also used in the
preservation of amla, beans, tamarind, etc.
c) Addition of vinegar: Vinegar is added to preserve food like pickles, salad dressings,
mustard, fish, etc.
d) Addition of other chemicals: Chemicals like sodium benzoate, salts of sorbic acid and
propionic acid etc., are used as preservatives.
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संबंधित प्रश्न
Define antioxidants?
Draw structure of BHT.
Write ‘four’ physical methods of preserving food materials
Which one of the following is a food preservative?
Equanil, Morphine, Sodium benzoate
Seeing the growing cases of diabetes and depression among young children, Mr Lugani, the principal of one reputed school, organised a seminar in which he invites parents and principals. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the health survey in most of the school and discovered a tremendous improvement in the health of the students
After reading the above passage, answer the following questions:
(i) What are the values (at least two) displayed by Mr Lugani?
(ii) As a student, how can you spread awareness about this issue?
(iii) What are antidepressant drugs? Give an example.
(iv) Name the sweetening agent used in the preparation of sweets for a diabetic patient.
Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.
After reading the above passage, answer the following :
(i) What are the values (at least two) displayed by Mr. Roy ?
(ii) As a student, how can you spread awareness about this issue ?
(iii) What are tranquillizers ? Give an example.
(iv) Why is use of aspartame limited to cold foods and drinks ?
What are food preservatives?
What are artificial sweetening agents? Give two examples.
What problem arises in using alitame as artificial sweetener?
Among the following, which one acts as a food preservative?
Aspartame, Aspirin, Sodium Benzoate, Paracetamol
Why the use of alitame as an artificial sweetener is not recommended?
Which of the following chemicals can be added for sweetening of food items at cooking temperature and does not provide calories?
Which of the following will not enhance nutritional value of food?
Which of the following are not used as food preservatives?
(i) Table salt
(ii) Sodium hydrogencarbonate
(iii) Cane sugar
(iv) Benzoic acid
Sugar is the main source of energy as it produces energy on metabolic decomposition. But these days low calorie drinks are more popular, why?
Pickles have a long shelf life and do not get spoiled for months, why?
Name an artificial sweetener which is derivative of sucrose.
Assertion: Artificial sweeteners are added to the food to control the intake of calories.
Reason: Most of the artificial sweeteners are inert and do not metabolise in the body.
Which synthetic sweetener is 100 times sweeter than cane sugar?
Which of the following is a naturally occurring antioxidant?
