Question

To study the conditions necessary for curdling of milk.
Materials required
Three bowls, luke warm milk, curd
Procedure
1. Take three bowls, label them 'A', 'B' and 'C'.
2. Pour some milk in bowl 'A', add a spoonful curd (starter) in it and stir it well. Cover it, and keep it
in the lab at room temperature.
3. Similarly, take bowl 'B', pour milk in it, add starter, cover it, and put it in a refrigerator.
4. In the same way, take bowl 'C', pour milk in it, but do not add any starter. Keep this bowl in the lab
at room temperature.
5. Leave all the three bowls for 4-5 hours. Open each bowl and note down your observations in the
table given below.
Observation
Observe the samples in bowl A, B and C.
Bowl 'A'______________
Bowl 'B'_______________
Bowl C_________________

Conclusion
The curdling of milk needs a starter (curd – which has a bacterium, Lactobacillus) in it and warmth.
Lactobacillus multiplies rapidly at room temperature and makes the milk thicker.

Answer 1

Answer:

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