Directorate of Education DOE Worksheet 12 Class 8 science | 26 August 2021

Directorate of Education, GNCT of Delhi keep giving assignments and worksheets to students of govt. schools of Delhi so that they are able to revise each and every topic easily. In this article, we are sharing solutions to the 4 questions given in Worksheet 12 dated 26 August 2021 for Class 8 Science.

Preservation of Substances is important for inhibiting the growth of microorganisms. There are various ways to prevent the growth of microorganisms in substances.

DOE Worksheet 12, Class 8 Science 26/08/2021

Question 1: Name any two chemical preservatives.

Ans 1: The two chemical preservatives are:

Sodium Benzoate

Sodium metabisulphite

Question 2: Name any four methods of food preservation

The four methods of preservation are:

Preservation by Sugar: Sugar reduces the  moisture content of the substance. We add sugar so that the growth of the microorganisms can be inhibited.

Preservation by Oil and Salt: Oil and salt act as natural preservatives. They do not allow microorganisms to destroy food substances.

Also Check: NCERT Solutions for Class 8 Science [ All Chapter PDFs]

Chemical Preservation: We can use chemical preservatives to stop the growth of microorganisms. Example of two chemical preservatives are Sodium benzoate and Sodium metabilsulphite.

Heating and Cooling: Heating on a particular temperature kills microorganisms and after that we let it cool down. So, by doing this we can keep a check on the growth of microorganisms.

Question 3: Why is more oil and salt added to the pickle?

more oil and salt is added to the pickle because both of them act as preservative and the microorganisms can’t survive in the environment where oil and salt is present.

Question 4: Name any four things made from mango that we can preserve.

Ans 4. The four things made from mango that we can preserve are:

1. Mango Candy
2. Aam Papad
3. Mango pickle
4. Mango Laccha

So, these were the solutions to DOE Worksheet 12 Class 8 for Science subject. The worksheet was given on 26/08/2021. If you have doubt in any of the question, feel free to ask us through the comments section below. Stay tuned to Careeradvcice4u for more directorate of education maths and science worksheet solutions.

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