ANP 1106 – FINAL EXAMINATION with
correct answers and rationale
updated 2026 graded A+
Animal Nutrition
100 Multiple Choice Questions — Answers Bolded + Rationale
SECTION 1: NUTRIENT CLASSES & BASIC NUTRITION (Q1–Q20)
Q1. Which of the following is NOT considered an essential nutrient for animals?
A) Water
B) Crude fiber
C) Amino acids
D) Minerals
B) Crude fiber
Rationale: Crude fiber is not an essential nutrient; it is a fraction of carbohydrate that is largely
indigestible. Essential nutrients include water, amino acids, fatty acids, vitamins, and minerals. Crude
fiber is simply a measure of insoluble fiber in feed analysis.
Q2. The six major classes of nutrients required by animals are:
A) Protein, fat, fiber, vitamins, minerals, water
B) Carbohydrates, proteins, lipids, vitamins, minerals, water
C) Starch, sugar, amino acids, fatty acids, vitamins, minerals
D) Glucose, amino acids, triglycerides, vitamins, minerals, enzymes
B) Carbohydrates, proteins, lipids, vitamins, minerals, water
Rationale: The six universally recognized classes of essential nutrients are carbohydrates, proteins,
lipids (fats), vitamins, minerals, and water. Fiber is a sub-fraction of carbohydrates, and enzymes are
not classified as a nutrient class.
,Q3. Which nutrient provides the highest energy per gram when completely oxidized?
A) Carbohydrate
B) Protein
C) Fat
D) Fiber
C) Fat
Rationale: Fat provides approximately 9.4 kcal/g (gross energy), while carbohydrates and proteins
each provide about 4.1–4.4 kcal/g. Fiber provides even less due to incomplete fermentation. Thus,
fat is the most energy-dense nutrient.
Q4. The main function of water in the animal body is:
A) Providing energy
B) Acting as a solvent and transport medium
C) Building muscle tissue
D) Synthesizing vitamins
B) Acting as a solvent and transport medium
Rationale: Water serves as the universal solvent, transport medium for nutrients and waste,
thermoregulator, and lubricant. It does not provide energy, build tissue directly, or synthesize
vitamins (though it participates in hydrolysis reactions).
Q5. Crude protein in feed analysis is calculated by multiplying total nitrogen by:
A) 5.25
B) 6.25
C) 7.25
D) 8.25
B) 6.25
Rationale: The Kjeldahl method measures total nitrogen, and since protein contains approximately
16% nitrogen (100/16 = 6.25), crude protein = N × 6.25. This assumes all nitrogen is from protein,
which overestimates true protein.
,Q6. Which of the following is a water-soluble vitamin?
A) Vitamin A
B) Vitamin D
C) Vitamin C
D) Vitamin E
C) Vitamin C
Rationale: Vitamin C (ascorbic acid) is water-soluble. Vitamins A, D, E, and K are fat-soluble vitamins.
Water-soluble vitamins include B-complex and C; fat-soluble include A, D, E, K.
Q7. The term "crude fiber" in feed analysis refers to:
A) Total dietary fiber
B) Residue remaining after sequential acid and alkali digestion
C) Cellulose and hemicellulose only
D) Lignin content of feed
B) Residue remaining after sequential acid and alkali digestion
Rationale: Crude fiber is the residue left after boiling feed in dilute acid (1.25% H₂SO₄) and then
dilute alkali (1.25% NaOH). It underestimates true fiber because some lignin and hemicellulose are
lost during the process.
Q8. Which of the following is an essential amino acid for poultry but NOT for adult ruminants?
A) Lysine
B) Methionine
C) Arginine
D) Leucine
C) Arginine
Rationale: Adult ruminants can synthesize arginine (and other urea cycle amino acids) in sufficient
amounts from rumen microbial protein and ammonia. Poultry cannot synthesize arginine and must
obtain it from the diet.
, Q9. The unit used to express energy content of feed in the United States is:
A) Joules (J)
B) Kilocalories (kcal) or Mcal
C) Megajoules (MJ) only
D) British Thermal Units (BTU)
B) Kilocalories (kcal) or Mcal
Rationale: In the US, feed energy is expressed in kilocalories (kcal) or megacalories (Mcal). In many
other countries (e.g., EU, Australia), MJ (megajoules) is used. 1 Mcal = 4.184 MJ.
Q10. Which of the following is a macromineral?
A) Iron
B) Zinc
C) Calcium
D) Iodine
C) Calcium
Rationale: Macrominerals (major minerals) are required in amounts >100 mg/kg diet and include Ca,
P, Na, Cl, K, Mg, S. Microminerals (trace minerals) include Fe, Zn, Cu, Mn, I, Se, Co, etc.
Q11. The main storage form of carbohydrate in animals is:
A) Cellulose
B) Starch
C) Glycogen
D) Sucrose
C) Glycogen
Rationale: Glycogen is the primary storage polysaccharide in animals, stored mainly in liver and
muscle. Starch is the plant storage carbohydrate. Cellulose is structural, and sucrose is a transport
sugar in plants.
Q12. Which vitamin is essential for blood clotting?
correct answers and rationale
updated 2026 graded A+
Animal Nutrition
100 Multiple Choice Questions — Answers Bolded + Rationale
SECTION 1: NUTRIENT CLASSES & BASIC NUTRITION (Q1–Q20)
Q1. Which of the following is NOT considered an essential nutrient for animals?
A) Water
B) Crude fiber
C) Amino acids
D) Minerals
B) Crude fiber
Rationale: Crude fiber is not an essential nutrient; it is a fraction of carbohydrate that is largely
indigestible. Essential nutrients include water, amino acids, fatty acids, vitamins, and minerals. Crude
fiber is simply a measure of insoluble fiber in feed analysis.
Q2. The six major classes of nutrients required by animals are:
A) Protein, fat, fiber, vitamins, minerals, water
B) Carbohydrates, proteins, lipids, vitamins, minerals, water
C) Starch, sugar, amino acids, fatty acids, vitamins, minerals
D) Glucose, amino acids, triglycerides, vitamins, minerals, enzymes
B) Carbohydrates, proteins, lipids, vitamins, minerals, water
Rationale: The six universally recognized classes of essential nutrients are carbohydrates, proteins,
lipids (fats), vitamins, minerals, and water. Fiber is a sub-fraction of carbohydrates, and enzymes are
not classified as a nutrient class.
,Q3. Which nutrient provides the highest energy per gram when completely oxidized?
A) Carbohydrate
B) Protein
C) Fat
D) Fiber
C) Fat
Rationale: Fat provides approximately 9.4 kcal/g (gross energy), while carbohydrates and proteins
each provide about 4.1–4.4 kcal/g. Fiber provides even less due to incomplete fermentation. Thus,
fat is the most energy-dense nutrient.
Q4. The main function of water in the animal body is:
A) Providing energy
B) Acting as a solvent and transport medium
C) Building muscle tissue
D) Synthesizing vitamins
B) Acting as a solvent and transport medium
Rationale: Water serves as the universal solvent, transport medium for nutrients and waste,
thermoregulator, and lubricant. It does not provide energy, build tissue directly, or synthesize
vitamins (though it participates in hydrolysis reactions).
Q5. Crude protein in feed analysis is calculated by multiplying total nitrogen by:
A) 5.25
B) 6.25
C) 7.25
D) 8.25
B) 6.25
Rationale: The Kjeldahl method measures total nitrogen, and since protein contains approximately
16% nitrogen (100/16 = 6.25), crude protein = N × 6.25. This assumes all nitrogen is from protein,
which overestimates true protein.
,Q6. Which of the following is a water-soluble vitamin?
A) Vitamin A
B) Vitamin D
C) Vitamin C
D) Vitamin E
C) Vitamin C
Rationale: Vitamin C (ascorbic acid) is water-soluble. Vitamins A, D, E, and K are fat-soluble vitamins.
Water-soluble vitamins include B-complex and C; fat-soluble include A, D, E, K.
Q7. The term "crude fiber" in feed analysis refers to:
A) Total dietary fiber
B) Residue remaining after sequential acid and alkali digestion
C) Cellulose and hemicellulose only
D) Lignin content of feed
B) Residue remaining after sequential acid and alkali digestion
Rationale: Crude fiber is the residue left after boiling feed in dilute acid (1.25% H₂SO₄) and then
dilute alkali (1.25% NaOH). It underestimates true fiber because some lignin and hemicellulose are
lost during the process.
Q8. Which of the following is an essential amino acid for poultry but NOT for adult ruminants?
A) Lysine
B) Methionine
C) Arginine
D) Leucine
C) Arginine
Rationale: Adult ruminants can synthesize arginine (and other urea cycle amino acids) in sufficient
amounts from rumen microbial protein and ammonia. Poultry cannot synthesize arginine and must
obtain it from the diet.
, Q9. The unit used to express energy content of feed in the United States is:
A) Joules (J)
B) Kilocalories (kcal) or Mcal
C) Megajoules (MJ) only
D) British Thermal Units (BTU)
B) Kilocalories (kcal) or Mcal
Rationale: In the US, feed energy is expressed in kilocalories (kcal) or megacalories (Mcal). In many
other countries (e.g., EU, Australia), MJ (megajoules) is used. 1 Mcal = 4.184 MJ.
Q10. Which of the following is a macromineral?
A) Iron
B) Zinc
C) Calcium
D) Iodine
C) Calcium
Rationale: Macrominerals (major minerals) are required in amounts >100 mg/kg diet and include Ca,
P, Na, Cl, K, Mg, S. Microminerals (trace minerals) include Fe, Zn, Cu, Mn, I, Se, Co, etc.
Q11. The main storage form of carbohydrate in animals is:
A) Cellulose
B) Starch
C) Glycogen
D) Sucrose
C) Glycogen
Rationale: Glycogen is the primary storage polysaccharide in animals, stored mainly in liver and
muscle. Starch is the plant storage carbohydrate. Cellulose is structural, and sucrose is a transport
sugar in plants.
Q12. Which vitamin is essential for blood clotting?
