MICROORGANISMS- POST-6


GOOD MORNING TO ALL OF YOU
                                                                                                                                   
LET'S BEGIN TODAY WITH A SHORT RECAP

https://www.youtube.com/watch?v=kYf_Sl8W3qY    ,


Today we are going to talk about 
FOOD PRESERVATION

We preserve food to:     

  • decrease the wastage of food
  • increase the shelf-life of perishable (that gets spoilt easily) food materials. 
  • to make food available to people in distant and remote places.
  • to ensure availability of out of season food materials.
In our houses we have seen common methods of food preservation like:

  • boiling of milk
  • salting of fish
  • using oil and vinegar for making pickles to make it last for a long period of time.
  • using the freezer and refrigerator to store food to last longer
  • drying of certain foodstuffs to be used at a later date
In all the above methods, we can observe that strong concentrations of salt, sugar, low and high temperatures,oil and lack of moisture prevent the multiplication of microbes thus preventing the quick spoilage of food.

Vacuum packaging or flushing the packets with nitrogen (like your chips packets) ensures that the microbes do not get oxygen to survive, thereby helping to prevent spoilage of food.

Chemical preservatives like Sodium benzoate and potassium metabisulphite are commonly used to preserve perishable foodstuffs for moderate periods of time.

This video brings to you the different methods of preservation

This alternate video discusses the same at a slightly slower pace for students who found the earlier video difficult to follow.

You will now be able to answer questions like:
  1. What are the advantages of food preservation?
  2. Which are the two commonly used chemicals to prevent spoilage of food?
  3. How does vacuum packaging prevent spoilage of food?
  4. Name any three ways used at home to prevent spoilage of food.
  5. From the video clipping you have seen, define pasteurization.
Did you know that there are certain animals that store their food in a very creative manner. For those students who are curious to find out more, here is a video for you to enjoy.


Grocery store items people aren't buying — and what you shouldFood Preservation Stock Photos And Images - 123RF      What is pasteurization, and how does it keep milk fresh for 9 ...



Cactus, Pickled Cucumber, Giardiniera, Pickling, Dill, Food, Half ...   



                 SEE YOU TOMORROW         😈                                  



Comments

  1. Daksh martinMay 21, 2020 at 8:47 AM

    good morning maam iam Daksh martin

    ReplyDelete
  2. AnonymousMay 21, 2020 at 9:27 AM

    Good morning Ma'am I am Achyut Tripathi

    ReplyDelete
  3. Abhay Singh UpmanyuMay 21, 2020 at 9:38 AM

    Good morning ma'am I am ABHAY SINGH UPMANYU of 8D

    ReplyDelete
  4. Akshat RauthanMay 21, 2020 at 11:24 AM

    Good morning ma'am I'm akshat Rauthan

    ReplyDelete
  5. ROHANMay 21, 2020 at 11:25 AM

    Good morning ma'am I am Rohan Bisht

    ReplyDelete
  6. KartikMay 21, 2020 at 11:33 AM

    Good morning ma'am I'm kartik of class 8-D

    ReplyDelete
  7. Maanvik SoodMay 21, 2020 at 11:41 AM

    Good Morning ma'am;this is Maanvik Sood.

    ReplyDelete
  8. Riddhesh S. LodhiMay 21, 2020 at 12:11 PM

    Good morning ma'am I am Riddhesh S. Lodhi of class 8th D

    ReplyDelete
  9. Varun negiMay 21, 2020 at 12:40 PM

    Good morning Ma'am I am Varun negi

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