Q.77
Which among the following statements are correct for "Direct Microscopic Count” (DMC) of milk?
(A) . Itis a long procedure and thus is not used as a platform test for milk.
(B) . It can not differentiate between live and dead bacterial cells.
(C) . In this test, staining is done with Newman stain.
(D) . Breed's pipette is used for this test
Choose the correct answer from the options given below:
- Principles of Direct Microscopic Count (DMC):
- Platform Test Utility: DMC is a very rapid platform test (takes only $10\text{--}15\text{ minutes}$) widely used in dairy reception docks for rapid screening, NOT a long procedure [Statement A is FALSE].
- Viability Discrimination: Direct microscopic counting cannot differentiate between viable (living) and dead bacterial cells, as both take up the basic dye [Statement B is TRUE].
- Newman-Lampert Stain: Newman's modified stain (containing methylene blue, ethyl alcohol, tetrachloroethane, and glacial acetic acid) is used to simultaneously defat, fix, and stain milk smears [Statement C is TRUE].
- Breed's Pipette: A calibrated Breed pipette delivers precisely $0.01\text{ ml}$ of milk over a calibrated $1\text{ cm}^2$ area on a glass slide to calculate the microscopic factor (MF) [Statement D is TRUE].
Correct option: (3) (B), (C) and (D) only.
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →