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Unit 4 Worksheet D

Rearrange the statements below to form the correct steps of a way 
of food preservation. Name the way of food preservation.

 Way of food preservation:__________________________________






i.Soak the mango slices in sugar solution.



ii.Wash and drain the mango slice again.



iii.Mix the mango slices with salt and store it  
    overnight.



iv.Cut the mangoes into slices.



v.Seal the bottle tightly.



vi.Wash the mango slices and drain.



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Unit 4 Worksheet C


A.   Answer the questions below.
Diagram 1 shows two groups of food.



Food A
Food B
Diagram 1

           
a. Suggest a way to preserve both groups of food shown above.

i) Food A:____________ ____ 

ii) Food B:_______________________

b. Explain why do we have to preserve food.

___________________________________

c. What happens if we do not preserve the food?

____________________________________

d. What will happen if we eat the food mentioned in ( c )?

______________________________________

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Unit 4 Worksheet B

State the method of food preservation according to the description.


1.    1. Microorganisms are unable to grow in a high acidity environment.
Answer:

2.    2. There is no air in the pocket of food, thus enabling the food to last longer.
Answer:

3.    3. The food is being cooked in high temperature and packed into tins.
Answer:

4.    4. Microorganisms are not active in a very cold environment, thus the food cannot be spoilt by the bacteria.
Answer:

5.    5. There is no water in the food for the microorganisms to survive or be active.
Answer:

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Unit 4 Worksheet A

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Food Preservation

Food preservation is the process making food keep longer. It can prevent or slow down the growth of bacteria and fungi.

a) Drying


b) Boiling


c) Cooling

d) Freezing



e) Vacuum packing

f) Pickling


g) Bottling and canning



h) Pasteurising


i) Salting

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Food Spoilage

Foods cannot keep long at room temperature. Food turns bad because of the growth of micro organisms such as bacteria and fungi. The faster the micro organisms grow, the faster the food will be spoilt.

Characteristics of spoilt food:
a) a bad smell

b) becomes slimy

c) becomes mouldy


d) becomes limp and wilted


e) dark spots

f) changes in colour and texture

Some examples of spoilt food
Food
Appearance
Bread
Mouldy
Patches of black and green
Unpleasant smell

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Questions of Section B Part 2

The table below shows the number of rhinoceros in a forest from 1998 to 2006.

Year
1998
2000
2002
2004
2006
Number of rhinoceros

480

400

320

240

160







a) State the changes in the number of rhinoceros from 1998 to 2006.

Ans :

 

b) What cause the changes in the number of rhinoceros as seen in the table above?
Ans :


c) State the thing that need to be
          i.Kept the same:
Ans :




ii.Changed:
Ans :   


                                     
d) State a relationship between what to change and what to measure.
Ans :



e) What is a rhinoceros hunted by humans for?
Ans :







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