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U2 B5 2HVTTO
B5 Food spoilage
Take off your jacket
Put your
things
on your
desk
Book, notebook, pencil case
Bag on the
floor
Read pages 125-127
timer
4:00
Lessongoals
You can describe ways to prevent food spoilage
1 / 17
suivant
Slide 1:
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Biologie
Middelbare school
havo, vwo
Leerjaar 2
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B5 Food spoilage
Take off your jacket
Put your
things
on your
desk
Book, notebook, pencil case
Bag on the
floor
Read pages 125-127
timer
4:00
Lessongoals
You can describe ways to prevent food spoilage
Slide 1 - Diapositive
Wheel of homework
Go to Lessonup.app and use this code
Reward
Penalty
Slide 2 - Diapositive
Clara is an adult woman. She calculates her BMI.
How should she do that?
A
B
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B
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B
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Slide 3 - 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 4 - 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 5 - 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 6 - Quiz
Why does food spoil?
Slide 7 - Question ouverte
What happens when you eat/drink spoiled food?
Slide 8 - 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 9 - Diapositive
Preserving - Water
Drying
Bacteria/fungi dry out
Slide 10 - Diapositive
Preserving - Cooling
Fridge > 3 - 4 °C
Bacteria/fungi are slowed
Deep freeze > -20 °C
Bacteria/fungi are frozen
Slide 11 - Diapositive
Preserving - heating
Pasteurization > 72 °C
Most bacteria/fungi are killed
Sterilization >130 - 140 °C
Bacteria/fungi are killed
Slide 12 - Diapositive
Preserving - Additives
Preservatives
Sugar Acid
Salt Sulphite
Vinegar
Additives
Colourings Aromas
Flavourings
Slide 13 - 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 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
Zs
= Working in Silence
No
asking questions
Silent,
don't disturb anyone
Stay at your
desk
timer
6:00
Slide 15 - 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 16 - Diapositive
Tidy Duty
Today these people are on tidy duty
Desks: empty and straight
Chairs: underneath the desks
Floor: no rubbish
Slide 17 - Diapositive
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