Tuesday, 27 November 2012

Exercise - Check Your Understanding

1. Fill in the blanks with the correct words.

    a. Food is heated before canning to kill ______________ .

    b. _______________ is the process of drying food with smoke.

    c. Freeze-dried food are easy to store and  ________________ .

2. Which of the following is not a reason why we need to preserve food ?

    a. For food to last longer                     b. For food to be stored easily

    c. To reduce wastage of food              d. To reduce the time taken for food to cook

3. Arrange the steps to salt fish in the correct order.

     P - Clean the fish with water

    Q - Rub salt into the fish

    R - Remove the internal organs of the fish

    a. P - Q - R         b. Q - P - R         c. P - R - Q        d. R - P - Q

4. Daniel investigated the time taken for moulds to grow on a piece of bread. He took two pieces of bread  
    and sprayed one of them with water. The results of his investigation are shown below.
Time taken for mould to grow ( days)
Without water
Sprayed with water

     a. In this investigation , identify what did Daniel:
         i. keep the same
         ii. change
        iii. observe

    b. What is the purpose of this investigation ?

    c. Name other factors that allow moulds to grow.

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