Question 1 What are pure substances? Question 2 What is a mixture?Give 5 examples of mixtures? Question 3 Why do we need to separate different components of a mixture?Explain with example? Question 4 Name a solid, liquid and a gaseous mixture? Question 5 State one use of winnowing? Question 6 Give one use of the hand-picking method of separating … [Read more...] about Threshing, Winnowing, Hand-Picking