Question

An equal amount of milk is taken in two bowls .Milk in one of the container is lukewarm while the milk in other container is hot .A small amount of lactobacillus bacteria is added to the milk that is lukewarm and a large amount of these bacteria were added to the hot milk. What will happen? Explain.​

Answer 1

Answer:

the milk will curdle due to the bacteria present.

Answer 2

Thanks for the question!!

✏ The experiment mainly aims for the result that whether curd will form in these bowl, Yes or No and their reasons.

❇ $\Large{ \underline{ \underline{ \red{ \bold{Results....}}}}}$

⸙ $\large{\underline{\purple{\rm{Bowl \:A}}}}$- The first bowl is containing Lukewarm milk, with average warm temperature. When the lactobacillus bacteria is added, they get activated due to availability of suitable temperature and necessary conditions. Now, they will grow and multiply. They convert the lactose to lactic acid, which is known as Curdling of milk. This leads to the conversion of milk into curd.

⸙ $\large{\underline{\purple{\rm{Bowl\: B}}}}$-The second bowl is containing hot boiled milk, with very high temperature. The bacteria added to this milk, will die eventually due to excess temperature. Hence, the milk will not be converted to curd. No curdling of milk takes place.

❇ $\Large{ \underline{ \underline{ \red{ \bold{How \: curdling \: occurs?}}}}}$

The Lactobacillus bacteria helps in the coagulation of casein present in milk. It helps in the curdling of milk when lactose sugar is converted to lactic acid. This leads to the souring of milk, and curd is formed. Generally, at high scale, Adding of Rennet or acid(lemon juice or Vinegar) is used to convert milk to curd.

✒ For the best quality of curd, Pasteurized milk is warmed to 30°C - 40°C and then some amount of curd is added to it. Lactobacillus bacteria present in curd, gets activated and further converts the milk into curd. In this way, curdling of milk occurs.

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