Question

Many direct and indirect tests are used to assess the microbial quality of raw milk. Among your opinion which one among the following is rapid indirect method most commonly used grading of raw milk at the reception dock in dairy industry.

• A. Standard plate count
• B. Direct microscopic count
• C. Whitehead and Cox test
• D. Methylene blue reduction time test

Hint:

Methylene blue reduction test: rapid indirect.
Standard plate count: direct but slow.
Used for grading raw milk.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Microbial quality of raw milk is assessed by various tests.
Some are rapid indirect methods.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the methods for assessing milk quality.
Step 3: Detailed Explanation:
The methylene blue reduction time test is a rapid indirect method.
It measures the time taken for methylene blue to be reduced.
This indicates the level of microbial activity.
Standard plate count is a direct but time-consuming method.
Direct microscopic count is a direct method.
Whitehead and Cox test is for the detection of mastitis.
Thus, the methylene blue reduction time test is the rapid indirect method.
Step 4: Final Answer:
The rapid indirect method is the methylene blue reduction time test.
Hence, the correct option is (D). \bigskip