Sub EVS Topic Food and its preservation (workbook work)

 

Workbook

1.      Write whether the following statements are true or false.

a.       

The act of chewing stimulates the salivary glands to release saliva. True

b.       

Pasteurisation involves heating milk at a very low temperature. False

c.        

Lemon is an example of a natural preservative. True

d.       

Improper storage of food leads to food spoilage. True

 

 

2.      Define the following

a.       

Microorganisms

ans:

Microorganisms are living things that are too small to be seen with the naked eye.

 

 

b.       

Health

ans:

Health is the state of complete physical and mental well-being and not merely the absence of diseases.

 

 

c.        

Digestion

ans:

The process by which food is broken down into simpler forms that can be absorbed by the body is known as digestion.

 

 

d.       

Preservative

ans:

Preservatives are chemical substances that are used to increase the shelf-life and prohibit the spoilage of different food items.

 

 

3.      Answer the following questions in 2-3 sentences.

a.       

State the importance of teeth in the process of digestion.

ans:

Teeth plays an important role in the process of digestion since they help

in biting and chewing the food.

 

 

b.       

Name two methods that can be used to preserve milk.

ans:

Pasteurization and boiling

c.        

Why does food stay fresh for a longer time when stored in a refrigerator?

ans:

Microorganisms like bacteria and fungi cannot survive at extremely low temperatures.Thus, food stays fresh for a longer time when stored in a refrigerator.

 

 

d.       

Oil is used in pickles. Give reason why.

ans:

Use of oil in pickles prevents food from coming into contact with microorganisms in the air. Thus, the growth of microorganisms is prevented.

 

 

4.      Picture study

The given images show a method of food preservation.


a.       

Identify the method and describe the technique used.

ans:

Pickling

b.       

Give two other examples of food items that can be preserved by this method.

ans:

pickles/ marmalades/ jellies.

 

5.      Fun Time

Unscramble the letters to find the words.

a.       

SERPREVATIVE:PRESERVATIVE

b.       

ORSAVY: SAVOURY

c.        

OILBING: BOILING

d.       

GEEFRZIN: FREEZING

 

6.      Challenge time

Digestion of food begins in the mouth. The act of chewing stimulates gland X to secret substance Y that helps to moisten the food. It also forms a bolus, which can be swallowed easily.

Identify X and Y.


X: Salivary gland

Y:Saliva

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