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For industrial yoghurt production, two bacterial strains are added to warm milk in a 1:1 proportion. Which pair is used?
AStreptococcus thermophilus and Lactobacillus delbrueckii
BAcetobacter aceti and Glucanobacter oxydans
CAspergillus oryzae and Aspergillus niger
DBifidobacterium bifidum and Clostridium botulinum
Answer & Solution
Correct answer: A. Streptococcus thermophilus and Lactobacillus delbrueckii
1. Yoghurt is made by inoculating warm milk with a 1:1 mix of two strains.
2. These are Streptococcus thermophilus and Lactobacillus delbrueckii.
3. The Acetobacter pair makes vinegar, so it is ruled out.
4. The Aspergillus pair is for soya sauce and acids, and Clostridium is a harmful gut microbe.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 7 "Introduction to Microbiology", p.87_
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