Nutritional Importance of Milk & Milk

By Skumar -

 

Nutritional Importance of Milk & Milk Processing


(Platform Tests to Marketing) – Complete Guide with 50 MCQs

Milk is considered a “complete food” because it provides almost all essential nutrients required for human growth, health, and development. Along with nutrition, proper reception, processing, and storage of milk are vital to ensure quality, safety, and shelf life.

This blog covers:
✔ Nutritional importance of milk
✔ Constituents of milk
✔ Reception and processing of milk
✔ 50 MCQs with answers & explanations (same place)

🧬 Nutritional Importance of Milk

Milk plays a vital role in:

  • Growth and development of children

  • Bone and teeth formation

  • Muscle building

  • Immunity boosting

  • Energy supply

Milk is especially important for infants, pregnant women, elderly people, and patients.

🥛 Constituents of Milk and Their Importance

1️⃣ Water (≈ 87%)

  • Acts as a medium for all nutrients

  • Maintains fluid balance in the body

2️⃣ Milk Fat (3–6%)

  • Rich source of energy

  • Contains fat-soluble vitamins (A, D, E, K)

  • Improves flavor and palatability

3️⃣ Proteins (3.2–3.5%)

  • Casein (80%) – growth and body building

  • Whey proteins (20%) – immunity and muscle repair

  • High biological value

4️⃣ Lactose (4.8–5%)

  • Milk sugar

  • Provides energy

  • Helps absorption of calcium

  • Supports beneficial gut bacteria

5️⃣ Minerals (0.7%)

  • Calcium & Phosphorus – bones and teeth

  • Potassium – nerve and muscle function

6️⃣ Vitamins

  • Fat-soluble: A, D, E, K

  • Water-soluble: B-complex, Vitamin C (low)

🏭 Reception and Processing of Milk

🧪 1. Platform Tests (Reception Tests)

Performed at milk reception dock to assess quality.

Common tests:

  • Organoleptic test (smell, taste, appearance)

  • Acidity test

  • Clot-on-boiling test (COB)

  • Alcohol test

  • Temperature test

Purpose:
✔ Reject poor quality milk
✔ Prevent spoilage

❄ 2. Chilling of Milk

  • Milk is cooled to 4°C or below

  • Prevents bacterial growth

  • Maintains freshness

⚖ 3. Standardization

  • Adjusting fat and SNF to desired levels

  • Ensures uniform quality

Example:

  • Toned milk

  • Double toned milk

🔄 4. Homogenization

  • Breaks fat globules into smaller size

  • Prevents cream separation

  • Improves digestibility and texture

🔥 5. Pasteurization

Heat treatment to destroy pathogenic microorganisms.

Types:

  • LTLT – 63°C for 30 min

  • HTST – 72°C for 15 sec

  • UHT – 135–150°C for 2–4 sec

🧊 6. Storage

  • Stored at ≤ 4°C

  • Prevents spoilage

  • Maintains quality

🚚 7. Marketing of Milk

  • Distribution to consumers

  • Forms:

    • Liquid milk

    • Packed milk

    • Value-added products (curd, butter, cheese)

📘 MCQ SECTION (50 MCQs with Answer & Explanation)

1. Milk is considered a complete food because:

A. It contains only protein
B. It provides all essential nutrients except iron ✅
C. It is rich only in fat
D. It is easy to digest

✔ Explanation: Milk supplies carbohydrates, proteins, fats, vitamins, and minerals but is deficient in iron.

2. Percentage of water in milk is approximately:

A. 70%
B. 75%
C. 87% ✅
D. 95%

✔ Explanation: Water forms the largest component of milk (~87%).

3. Main protein of milk is:

A. Albumin
B. Globulin
C. Casein ✅
D. Keratin

✔ Explanation: Casein constitutes about 80% of total milk protein.

4. Milk fat is important because it:

A. Provides minerals
B. Supplies energy and fat-soluble vitamins ✅
C. Acts as preservative
D. Prevents spoilage

5. Milk sugar is known as:

A. Glucose
B. Fructose
C. Lactose ✅
D. Sucrose

6. Which mineral is most abundant in milk?

A. Iron
B. Sodium
C. Calcium ✅
D. Zinc

7. Which vitamin is deficient in milk?

A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Iron ✅

8. Platform tests are conducted:

A. At consumer level
B. At milk reception dock ✅
C. At retail shop
D. During marketing

9. COB test detects:

A. Fat content
B. Acidity
C. Protein quality
D. Heat stability of milk ✅

10. Chilling temperature of milk should be:

A. 10°C
B. 8°C
C. 4°C or below ✅
D. 20°C

11. Purpose of chilling milk is to:

A. Improve taste
B. Increase fat
C. Reduce bacterial growth ✅
D. Improve color

12. Standardization refers to:

A. Removing microbes
B. Adjusting fat and SNF ✅
C. Heating milk
D. Cooling milk

13. Homogenization prevents:

A. Microbial growth
B. Spoilage
C. Cream separation ✅
D. Sour taste

14. Homogenization improves:

A. Shelf life
B. Digestibility ✅
C. Mineral content
D. Acidity

15. Pasteurization aims to destroy:

A. All bacteria
B. Pathogenic microorganisms ✅
C. Spores
D. Enzymes only

16. LTLT pasteurization temperature is:

A. 72°C for 15 sec
B. 63°C for 30 min ✅
C. 90°C for 5 min
D. 100°C for 1 min

17. HTST method uses:

A. Low temperature long time
B. High temperature short time ✅
C. Ultra heating
D. Boiling

18. UHT milk has shelf life of:

A. 1–2 days
B. 5–7 days
C. Several months ✅
D. 1 year refrigerated

19. Storage temperature of pasteurized milk is:

A. 10°C
B. 8°C
C. ≤ 4°C ✅
D. Room temperature

20. Milk marketing includes:

A. Production only
B. Distribution only
C. Selling milk and milk products ✅
D. Processing only

21. Which component of milk helps in absorption of calcium?

A. Fat
B. Protein
C. Lactose ✅
D. Water

✔ Explanation: Lactose enhances calcium absorption in the intestine.

22. Whey proteins are mainly important for:

A. Bone formation
B. Immunity and muscle repair ✅
C. Energy supply
D. Fat digestion

23. Biological value of milk protein is:

A. Low
B. Medium
C. High ✅
D. Very low

✔ Explanation: Milk proteins contain all essential amino acids, hence high biological value.

24. Which test checks sourness of milk?

A. Alcohol test
B. Acidity test ✅
C. COB test
D. Fat test

25. Alcohol test mainly indicates:

A. Fat content
B. Milk density
C. Heat stability ✅
D. Color

26. Organoleptic test includes:

A. Fat and SNF
B. Smell, taste, appearance ✅
C. Bacterial count
D. Temperature

27. Chilling should be done immediately after milking because:

A. Milk spoils quickly
B. Enzymes increase
C. Bacteria multiply rapidly ✅
D. Fat melts

28. Standardization helps in:

A. Removing microbes
B. Uniform milk quality ✅
C. Increasing vitamins
D. Improving color

29. Toned milk generally contains:

A. High fat
B. Medium fat
C. Low fat ✅
D. No fat

30. Homogenization pressure breaks fat globules into:

A. Larger size
B. Unequal size
C. Smaller uniform size ✅
D. Solid particles

31. Homogenized milk appears:

A. Watery
B. Creamy and uniform ✅
C. Thick curd
D. Yellowish

32. Pasteurization does NOT destroy:

A. Pathogenic bacteria
B. Most spoilage organisms
C. All spores ✅
D. Disease-causing microbes

33. Which organism is targeted during pasteurization?

A. Thermophiles
B. Psychrophiles
C. Pathogens ✅
D. Spores

34. Pasteurized milk should be:

A. Stored at room temperature
B. Stored below 4°C ✅
C. Boiled again compulsorily
D. Frozen

35. Shelf life of pasteurized milk is usually:

A. 1 day
B. 2–3 days
C. 5–7 days (refrigerated) ✅
D. 1 month

36. UHT milk is packed under:

A. Open conditions
B. Vacuum
C. Aseptic conditions ✅
D. Refrigeration only

37. Which vitamin is fat-soluble in milk?

A. Vitamin B1
B. Vitamin B2
C. Vitamin A ✅
D. Vitamin C

38. Which vitamin is present in small amount in milk?

A. Vitamin A
B. Vitamin D
C. Vitamin B-complex
D. Vitamin C ✅

39. Milk fat percentage is highest in:

A. Cow milk
B. Buffalo milk ✅
C. Goat milk
D. Human milk

40. SNF stands for:

A. Solid Natural Fat
B. Solids Not Fat ✅
C. Simple Nutrient Fraction
D. Saturated Neutral Fat

41. SNF includes:

A. Fat only
B. Water only
C. Lactose, protein, minerals ✅
D. Vitamins only

42. Marketing of milk ensures:

A. Quality control
B. Profit to producer
C. Availability to consumer
D. All of the above ✅

43. Value-added milk products include:

A. Raw milk only
B. Pasteurized milk
C. Curd, butter, cheese ✅
D. Watered milk

44. Which process improves shelf life without refrigeration?

A. Pasteurization
B. Homogenization
C. UHT processing ✅
D. Chilling

45. Milk is deficient mainly in:

A. Calcium
B. Protein
C. Iron ✅
D. Fat

46. Main function of calcium in milk is:

A. Energy supply
B. Blood circulation
C. Bone and teeth formation ✅
D. Digestion

47. Milk proteins are classified into:

A. Casein and whey ✅
B. Albumin only
C. Globulin only
D. Enzymes

48. Homogenization is done:

A. Before milking
B. After pasteurization only
C. Before or after pasteurization ✅
D. During marketing

49. First step in milk processing is:

A. Pasteurization
B. Chilling
C. Reception and testing ✅
D. Packaging

50. The main objective of milk processing is to:

A. Increase quantity
B. Improve taste only
C. Ensure safety and quality ✅
D. Reduce nutrients


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