Question

Both male and female pigeons secrete milk through

• A. salivary glands
• B. modified sweat glands
• C. crop
• D. gizzard.

Answer 1

The Correct Option is C

The question is about identifying the source through which both male and female pigeons secrete milk. Pigeon's milk is essential for feeding their young ones and is a fascinating aspect of avian biology.

Pigeons, uniquely among birds, produce a substance known as "crop milk." This is a secretion derived from the lining of the crop. Let's understand why "crop" is the correct answer by examining each option:

• Salivary glands: In birds, including pigeons, salivary glands are primarily used to produce saliva to aid in the digestion and lubrication of food. They do not secrete milk.
• Modified sweat glands: Sweat glands are present in mammals and are used for thermoregulation, not in birds. Birds do not have sweat glands because they do not sweat, and therefore, modified sweat glands cannot be responsible for milk secretion.
• Crop: The crop is a specialized storage pouch in the alimentary canal of birds. In pigeons, the crop epithelium thickens and sheds to produce a nutritious, milk-like substance known as crop milk. Both male and female pigeons have this capability to produce crop milk, which is used to feed their chicks during the first few days after hatching.
• Gizzard: The gizzard, also known as the muscular stomach, is used for grinding up food with the help of ingested stones. It is not involved in milk secretion.

Thus, the correct answer is crop, as it explains the unique mechanism in pigeons for producing nutrient-rich milk-like secretions to feed their young.

To summarize, out of the given options, the only structure responsible for milk secretion in both male and female pigeons is the crop.