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प्रश्न
Explain any two chemical methods of food preservation.
Describe ‘any two’ chemical methods of food preservation.
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
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 ?
On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the
National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.
(i) Write the values shown by
(a) Dr. Satpal
(b) NHRC
(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer ?
(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients
Why is use of aspartame limited to cold foods and drinks?
Name a sweetening agent used in the preparation of sweets for a diabetic patient.
Among the following, which one acts as a food preservative?
Aspartame, Aspirin, Sodium Benzoate, Paracetamol
Seeing the growing cases of diabetes and depression among children, Mr. Chopra, the principal of one reputed school organized a seminar in which he invited parents and principals. They all resolved this issue by strictly banning the junk food in schools and by introducing 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. Chopra 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 questions :
(i) What are the values (at least two) displayed by Mr. Chopra ?
(ii) As a student, how can you spread awareness about this issue ?
(iii) Why should antidepressant drugs not be taken without consulting a doctor ?
(iv) Give two examples of artificial sweeteners.
Write one example each of Antacids.
Why the use of alitame as an artificial sweetener is not recommended?
Which of the following will not enhance nutritional value of food?
Pickles have a long shelf life and do not get spoiled for months, why?
What is the difference between saccharin and saccharic acid?
Name an artificial sweetener which is derivative of sucrose.
Name two α-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening?
Sodium salts of some acids are very useful as food preservatives. Suggest a few such acids.
Assertion: All chemicals added to food items are called food preservatives.
Reason: All these chemicals increase the nutritive value of the food.
Rayon is:
Which of the following is a naturally occurring antioxidant?
