What is the main difference between the testes of mammals and the testes of poultry?

What is the main difference between the testes of mammals and the testes of poultry?

• A. The testes of poultry do not descend out of the abdominal cavity.
• B. Mammals have one testicle.
• C. The testes of mammals do not descend out of the abdominal cavity.
• D. Poultry have one testicle.

Answer: (A)

The main idea is where the testes sit and whether they descend outside the abdomen. In birds, the testes stay inside the body near the kidneys and do not descend into a scrotum. In most mammals, the testes are outside the abdominal cavity in a scrotum, which helps keep them cooler for sperm production. Because poultry maintain internal, non-descended testes, the statement that poultry testes do not descend out of the abdominal cavity is correct. The other points conflict with general anatomy: mammals typically have two testes (not one), and birds also have two (even though they remain internal), so those descriptions aren’t accurate.

The main idea is where the testes sit and whether they descend outside the abdomen. In birds, the testes stay inside the body near the kidneys and do not descend into a scrotum. In most mammals, the testes are outside the abdominal cavity in a scrotum, which helps keep them cooler for sperm production. Because poultry maintain internal, non-descended testes, the statement that poultry testes do not descend out of the abdominal cavity is correct. The other points conflict with general anatomy: mammals typically have two testes (not one), and birds also have two (even though they remain internal), so those descriptions aren’t accurate.