Question

What happens when milk is left open at room temperature during summers

Answer 1

lactobacillus bacteria keeps on multiplying due to temperature and thus milk gets converted to curd

Answer 2

when milk is left open at room temperature during summer it convert into a curd due to the increase in the number of bacteria in the milk

as bacteria require a moderate temperature for their survival due to extreme cold and extreme hot it will die that is why we used to hot the milk or kept it in a refrigerator