Video Tutorial on When and How was the fabric discovered

Everyone of us knows about the fabrics i.e Cotton, Silk, Linen etc. But now with the help of Extramarks online video tutorials, let us study the topic, When and How the fabric was discovered for class 6 to class 8. These videos are made for the students to have a better understanding of the topic. To get access to these videos, visit and register at Extramarks website.
https://www.youtube.com/watch?v=ZGwKbk-TqIg