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Questions
Explain any two chemical methods of food preservation.
Describe ‘any two’ chemical methods of food preservation.
Solution
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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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.
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 do we require artificial sweetening agents?
What are food preservatives?
Why is use of aspartame limited to cold foods and drinks?
What are artificial sweetening agents? Give two examples.
What problem arises in using alitame as artificial sweetener?
Write one example each of Antacids.
Why the use of alitame as an artificial sweetener is not recommended?
Why the use of alitame as an artificial sweetener is not recommended?
Which of the following are not used as food preservatives?
(i) Table salt
(ii) Sodium hydrogencarbonate
(iii) Cane sugar
(iv) Benzoic acid
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: 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.
Rayon is:
Which synthetic sweetener is 100 times sweeter than cane sugar?
Which of the following is a naturally occurring antioxidant?
The artificial sweetener that has the highest sweetness value in comparison to cane sugar is ______.
