Question

why curd turns more sore in summer than in winter

Answer 1

Curd turn more sore in summer than winter because growth of bacteria in the curd is faster in summer than winter.

Answer 2

in summers the temperature is optimum for the multiplication of the lactobacillus ( the bacteria that converts milk into curd) than in winters so the curd becomes more sore in summers than winters.
hope this helps u...