Question

Name a food product prepared by the action of bacteria:

• A. Curd
• B. Ice-cream
• C. Sugarcane juice
• D. Cold-drinks

Hint:

Lactic Acid Bacteria (LAB): \[ \textit{Lactobacillus} \] converts: \[ \text{Milk} \rightarrow \text{Curd} \] LAB also improves the nutritional quality of curd by increasing the availability of Vitamin \(B_{12}\). A very important NCERT fact from Microbes in Human Welfare.

Answer 1

The Correct Option is A

Step 1: Recall the role of bacteria in food production. Several food products are prepared through microbial fermentation. One of the most common examples is curd, which is produced by the activity of lactic acid bacteria (LAB).

Step 2: Understand curd formation. Lactic acid bacteria such as: \[ \textit{Lactobacillus} \] convert lactose present in milk into lactic acid. The lactic acid coagulates milk proteins and converts milk into curd.

Step 3: Evaluate the options.
• Curd \(\rightarrow\) Produced by bacterial fermentation \(\checkmark\)
• Ice-cream \(\rightarrow\) Not prepared by bacterial action \(\times\)
• Sugarcane juice \(\rightarrow\) Natural plant product \(\times\)
• Cold-drinks \(\rightarrow\) Manufactured beverages, not produced by bacterial fermentation \(\times\) Therefore, \[ \boxed{\text{Curd}} \] is the food product prepared by the action of bacteria. Hence, the correct answer is: \[ \boxed{\text{(A)}} \]