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B5 Food spoilage
Lessongoals
  • You can describe ways to prevent food spoilage
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Slide 1: Diapositive
BiologieMiddelbare schoolhavo, vwoLeerjaar 2

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B5 Food spoilage
Lessongoals
  • You can describe ways to prevent food spoilage

Slide 1 - Diapositive

Clara is an adult woman. She calculates her BMI.
How should she do that?
A
BMI=weight2length
B
BMI=lenght2weight
C
BMI=weightlength2
D
BMI=lengthweight2

Slide 2 - Quiz

When she calculates her BMI it is 23,5. What does this mean for her?
A
Her weight is too low
B
Her weight is healthy
C
Her weight is too high
D
Her weight is way too high

Slide 3 - Quiz

A certain foodstuff contains 20 kJ of energy. How much J is that?
A
2.000 J
B
20.000 J
C
0,002 J
D
0,02 J

Slide 4 - Quiz

Meyra en Miray are twins. The amount of energy they need is not the same.
What is the most logical reason for this difference?
A
Their sex is different
B
Their body length is different
C
Their age is different
D
Their physical activity is different

Slide 5 - Quiz

Why does food spoil?

Slide 6 - Question ouverte

What happens when you eat/drink spoiled food?

Slide 7 - Question ouverte

Food spoilage
Bacteria and fungi eat our food = food spoilage
They need:
  • Food
  • Moisture
  • Right temperature
  • Right environment

Preserving food is done by changing these things. making it impossible/hard to live on the food for bacteria/fungi

Slide 8 - Diapositive

Preserving - Water
  • Drying
             Bacteria/fungi dry out

Slide 9 - Diapositive

Preserving - Cooling
  • Fridge > 3 - 4 °C
            Bacteria/fungi are slowed
  • Deep freeze > -20 °C
            Bacteria/fungi are frozen

Slide 10 - Diapositive

Preserving - heating
  • Pasteurization > 72 °C
           Most bacteria/fungi are killed
  • Sterilization >130 - 140 °C
            Bacteria/fungi are killed

Slide 11 - Diapositive

Preserving - Additives
  • Preservatives 
           Sugar                   Acid
           Salt                       Sulphite
           Vinegar
  • Additives
            Colourings       Aromas
            Flavourings

Slide 12 - Diapositive

Preserving - other ways
  • Irradiation
             Bacteria/fungi are killed with radioactive rays
  • Inert packing
             Adding a mixture of gases to the packaging helps the food stay fresh                 longer
  • Vacuum packing
            After pasteurization/sterilization/preservatives/inert packing
           Bacteria/fungi are unable to reach the food

Slide 13 - Diapositive

What you should do:
  • Read pages  125-127
  • Do asgmt  1-8, 4c pgs. 128-131

Done with the above?
  • Work on the next chapter(s)
  • Learn for the test 
  • Make other homework
  • Read a book
Zs = Working in Silence
  • No asking questions
  • Silent, don't disturb anyone
  • Stay at your  desk
timer
6:00

Slide 14 - Diapositive

What you should do:
  • Read pages 125-127
  • Do asgmt 1-8, 4c pgs. 128-131

Done with the above?
  • Work on the next chapter(s)
  • Learn for the test 
  • Make other homework
  • Read a book
Zw = Working with whispering
  • Teacher is available for questions
  • Only whisper with the student next to you
  • Stay at your  desk

Slide 15 - Diapositive

Tidy Duty
Today these people are on tidy duty
  • Desks: empty and straight
  • Chairs:  underneath the desks
  • Floor: no rubbish

Slide 16 - Diapositive