Question

Which microorganism is used in curd ?

• A. Yeast
• B. Rhizobilium
• C. Lactobacillus
• D. Penicillium

Hint:

Lactic acid bacteria set curd from milk.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
Curd forms when milk is fermented by bacteria. We need the correct microorganism.

Step 2: Key Concept:
Lactobacillus is a bacterium that turns the milk sugar (lactose) into lactic acid. The acid makes milk proteins clump together, forming curd.

Step 3: Check option 1:
Yeast is a fungus used in baking bread and making alcohol. It is not used to set curd. So option 1 is wrong.

Step 4: Check option 2:
Rhizobium (printed as Rhizobilium) lives in root nodules of legumes and fixes nitrogen. It has no role in curd. So option 2 is wrong.

Step 5: Check option 3:
Lactobacillus is the bacterium that sets curd, so option 3 is right.

Step 6: Check option 4:
Penicillium is a mould that gives the antibiotic penicillin. It is not used in curd. So option 4 is wrong.

Final Answer:
Curd is made by Lactobacillus, which is option 3. \[ \boxed{\text{Option 3}} \]