ARPAS Poultry Science Professional Online Exam
Questions and Answers
1. Which amino acid is typically considered the first limiting amino acid in a standard corn-
soybean meal diet for broilers?
A. Lysine
B. Tryptophan
C. Threonine
D. Methionine
Correct Answer: D
Expert Explanation: In poultry diets based on corn and soybean meal, methionine is the
first limiting amino acid because corn is deficient in sulfur-containing amino acids.
2. In the avian female reproductive tract, where does fertilization specifically occur?
A. Magnum
B. Isthmus
C. Uterus
D. Infundibulum
Correct Answer: D
Expert Explanation: The infundibulum is the site where the ovum is captured after
ovulation and where fertilization by sperm occurs before the albumen is added.
3. Which organ in the poultry digestive system is responsible for the mechanical grinding of
feed?
A. Ventriculus
B. Crop
C. Proventriculus
D. Ceca
Correct Answer: A
Expert Explanation: The ventriculus, also known as the gizzard, uses strong muscular
contractions and often grit to mechanically grind food particles.
4. Marek’s Disease is caused by which type of infectious agent?
A. Herpesvirus
, B. Bacteria
C. Protozoa
D. Paramyxovirus
Correct Answer: A
Expert Explanation: Marek’s Disease is a highly contagious viral neoplastic disease in
chickens caused by an alphaherpesvirus.
5. What is the primary function of the air sacs in the avian respiratory system?
A. Gas exchange
B. To produce vocal sounds
C. To filter dust and pathogens
D. To store and move air through the lungs
Correct Answer: D
Expert Explanation: Air sacs act as bellows to move air through the fixed-volume lungs;
gas exchange actually occurs in the parabronchi of the lungs, not the air sacs.
6. What is the average incubation period for a chicken egg?
A. 28 days
B. 21 days
C. 14 days
D. 30 days
Correct Answer: B
Expert Explanation: The standard incubation period for Gallus gallus domesticus is 21
days, though temperature fluctuations can slightly alter this.
7. Which enzyme is commonly added to poultry diets to increase the availability of plant-
bound phosphorus?
A. Amylase
B. Lipase
C. Protease
D. Phytase
Correct Answer: D
Questions and Answers
1. Which amino acid is typically considered the first limiting amino acid in a standard corn-
soybean meal diet for broilers?
A. Lysine
B. Tryptophan
C. Threonine
D. Methionine
Correct Answer: D
Expert Explanation: In poultry diets based on corn and soybean meal, methionine is the
first limiting amino acid because corn is deficient in sulfur-containing amino acids.
2. In the avian female reproductive tract, where does fertilization specifically occur?
A. Magnum
B. Isthmus
C. Uterus
D. Infundibulum
Correct Answer: D
Expert Explanation: The infundibulum is the site where the ovum is captured after
ovulation and where fertilization by sperm occurs before the albumen is added.
3. Which organ in the poultry digestive system is responsible for the mechanical grinding of
feed?
A. Ventriculus
B. Crop
C. Proventriculus
D. Ceca
Correct Answer: A
Expert Explanation: The ventriculus, also known as the gizzard, uses strong muscular
contractions and often grit to mechanically grind food particles.
4. Marek’s Disease is caused by which type of infectious agent?
A. Herpesvirus
, B. Bacteria
C. Protozoa
D. Paramyxovirus
Correct Answer: A
Expert Explanation: Marek’s Disease is a highly contagious viral neoplastic disease in
chickens caused by an alphaherpesvirus.
5. What is the primary function of the air sacs in the avian respiratory system?
A. Gas exchange
B. To produce vocal sounds
C. To filter dust and pathogens
D. To store and move air through the lungs
Correct Answer: D
Expert Explanation: Air sacs act as bellows to move air through the fixed-volume lungs;
gas exchange actually occurs in the parabronchi of the lungs, not the air sacs.
6. What is the average incubation period for a chicken egg?
A. 28 days
B. 21 days
C. 14 days
D. 30 days
Correct Answer: B
Expert Explanation: The standard incubation period for Gallus gallus domesticus is 21
days, though temperature fluctuations can slightly alter this.
7. Which enzyme is commonly added to poultry diets to increase the availability of plant-
bound phosphorus?
A. Amylase
B. Lipase
C. Protease
D. Phytase
Correct Answer: D
