PUMPA - THE SMART LEARNING APP

Take a 10 minutes test to understand your learning levels and get personalised training plan!

Download now on Google Play

Theory:

Activity 3.4
  
Discuss with your classmates whether it is fair for people to raise sheep and then shave their heads to get wool.

Yes, it's necessary as the rearing process happens during the summer season.
This extraction of wool helps the sheep to survive in summer temperatures.
It is done in a way we cut our hair, and as far as modern methods are involved, we aren't harming the sheep.

Explanation:
 
Shearing never harms a sheep or leaves no destructive effect on the animal.
The fleeces or wools overgrow in sheep, and if they are not cropped regularly, the sheep feel uneasy and stressed, particularly in a hot and humid climate.
 
Activity 3.5
 
Gather pieces of silk cloth of different types and paste them into your scrap or notebook. You can get them in a tailor’s shop or garments among the heap of waste cut pieces.
 
bright-g4310a062c_1920.jpg
A pile of silk sarees
 
Activity 3.6
  
Take a synthetic (artificial) silk thread and a pure silk thread. Burn these threads carefully. Did you see any discrepancy in the smell while burning? Now, burn a woollen fibre carefully. Did it smell like the burning of artificial silk or pure silk? Can you explain why?
 
Because synthetic silk is constructed of plant fibres, it smells like burning paper or plastic, whereas knitted silk is made of protein molecules and has a burning hair odour when burned.
 
Activity 3.7
  
Photocopy the life cycle or life history of the silk moth, and paste them on pieces of chart paper or cardboard. Shuffle them. Now try to place the stages in the proper sequence in a cyclic form; whoever does it quickly wins.
  
6.png
The life cycle of the silkworm