Question

Take some lukewarm milk in two small bowls. Add a few drops of butter milk or little curd in one of the bowls. In the second bowl do not add anything. Keep the two bowls in a warm place and observe the milk in the bowls after 5 to 6 hours.

a) What changes did you observe?

b) What is the reason for this?

Answer 1

a) In the first bowl milk changed into curd. There is no change in the second bowl.

b) We add curd or butter milk in the first bowl. Curd or buttermilk contain bacterium named lactobacillus. Lactobacillus converts the milk into curd.