Question

why it is difficult to prepare curd in winters??

Answer 1

Curd is prepared with help of lactos basillus, which is a kind of bacterium, so bacterias are unable to multiply in the milk and are inactive, so they donot fermented the milk because of the cold temperature with less humidity....
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Answer 2

Lactobacillus is a bacteria that helps in the formation of curd it grows at a fast rate in temperature from 25 degree Celsius to 30 degree Celsius during winter the temperature goes below 25 degree Celsius so the rate of the growth of bacteria slows down that's why it is difficult to prepare curd in winter as compared to summer