Question

Raw mango pickle is made with plenty of salt and oil. How does the salt help preserve the pickle?

Equal samples of fresh milk were kept at four temperatures for 1 day, and the number of bacterial colonies grown from each was counted (see bar graph). (a) At which temperature did bacteria grow most? (b) How many times more colonies were there at 37 °C than at 4 °C? (c) What advice would you give a shopkeeper about storing milk, and why?