components of food (post-3)

Components of Food Part 3

School children in lab | Educational activities for preschoolers ...

Welcome back to our science class. During our last class we learnt about the different types of Carbohydrates . I do hope you are reasonably thorough  and can differentiate one from the other.

Today we will learn  a few Food Tests.

What are these food tests?
Well  they are simple tests by which we can test a particular food and check whether it contains sugar, starch, fat or protein.

...............................................................................................................................................................

The TEST FOR STARCH   you  were familiarized with in class 4……. 

Do you recall  how a leaf was tested for the presence of Starch  ?

  Name the liquid  that is used to test whether a given liquid or substance  contains Starch ?
.
   YOU are ABSOLUTELY RIGHT… it is IODINE. 


Iodine test for starch - Stock Image - C023/0569 - Science Photo ...
DO the questions  written in green in your notebook

7) Write the tests for the following-
a)TEST FOR STARCH: 
  • Take the food material or a suspension of the food to be tested 
  • Add a few drops of Iodine Solution  (REDDISH BROWN IN COLOUR) 
  • IF  the food item / the suspension becomes BLUISH BLACK in colour it indicates the presence of Starch.
Click on the following link which demonstrates the presence of starch : https://www.youtube.com/watch?v=5YMDOX71TeI


.............................................................................................................................................................


b)TEST FOR SUGAR:
  • MAKE  a suspension of the substance to be tested. 
  • Add a few Drops of BENEDICT ‘S REAGENT and heat the mixture. 
  • AN ORANGE RED precipitate indicates the presence of Glucose.

Organic Compounds | The Chemistry Of Life | Siyavula


Click on the following link to view a demonstration of the test : https://www.youtube.com/watch?v=HxevnEdU9AI

.........................................................................................................................................................


c)TEST FOR FAT:  
  •  Crush the FOOD sample on a piece of White Paper. 
  • IF the paper becomes translucent it indicates the presence of FAT / OILS

 Peanut Oil - 7 Amazing Health Benefits and Side Effects

Activity to try at home
 Take  a few groundnuts, or til or almonds or cashew nuts or walnuts and crush one on a sheet of paper. Crush it with a rolling pin (बेलन ) … it leaves an oil stain

............................................................................................................................................................

 ✍ Writing Hand U+270D
The  three food tests which  are given in  green  are to be written  out  in your note book.( dont draw the pictures)


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HOTS!

French fries - Healthy or Unhealthy ?
What do you think are the nutrients in it?
Which food tests would be positive? 

France, Belgium argue over who really invented French fries



Comments

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