G6 Q1 WEEK 4-6 SEPARARING MIXTURES THROUGH WINNOWING.pptx

science class

1. SEPARATING MIXTURES THROUGH WINNOWING

2. WINNOWING Wind winnowing  is an  agricultural  method developed by ancient cultures for separating  grain  from  chaff . It is also used to remove hay and chaff or other pests from stored grain.  Threshing , the loosening of grain or seeds from the husks and straw, is the step in the chaff-removal process into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery. Techniques included using a winnowing fan (a shaped basket shaken to raise the chaff) or using a tool (a winnowing fork or shovel) on a pile of harvested grain.

3.   Winnowing is the method in which heavier components of the mixture are separated from the lighter substances with the help of wind. This method is used for separating grains from husk after the process of threshing. Threshing is the process of separating grain from chaff. In this process, a mixture of wheat and husk is dropped from a height. After that, husk is carried by the wind and forms a heap at some distance away. The husk being lighter is carried away by the wind and forms a different heap. The heavier particle (wheat grains) forms a separate heap as it falls vertically downward. To separate dirt from pulses, we add water to pulses. Dirt will get dissolved in water and husk will float on top because it is lighter and pulse grains will settle down.

4. WINNOWING

5. THRESHING

6. Advantage of Winnowing This method doesn’t require any machines for its functioning. It is completely based on human activity and hence it takes less time to process and definitely very cheap. Disadvantage of Winnowing Winnowing is defined as a method in which heavier components of the mixture are separated from the lighter substances with the help of wind but this process does not work for materials heavier than grains like stones.

7. ACTIVITY 4.2 WINNOWING MATERIALS: CHAFF GRAINS WINNOW PROCEDURE: 1.MIX THE CHAFF AND THE GRAINS ON A WINNOW. 2.TURN ON THE ELECTRIC ,USING THE AIR BLOW COMING FROM THE FAN START TO WINNOW THE DRY MIXTURE. 3. OBSERVE WHAT WILL HAPPEN ON THE MIXTURE. 4.RECORD YOUR DATA ON YOUR PAPER. GUIDE QUESTION WHAT IS THE ADVANTAGES AND DISADVANTAGES OF WINNOWING?

8. WHAT DID YOU LEARNED IN OUR LESSON?

9. EVALUATION: 1. WHAT IS WINNOWING? 2.WHAT IS THE ADVANTAGES OF WINNOWING? 3.WHAT IS THE DISADVANTAGES OF WINNOWING?

10. THANK YOU FOR LISTENING!