Concept:Chalaza is a protein strand that anchors the yolk inside the egg; it is secreted in the hen's oviduct during egg formation.
Explanation:The diagram shows the reproductive tract of a hen where the egg is formed.
After the yolk is released from the ovary, it enters the funnel-shaped part labeled I, known as the infundibulum.
Chalaza is formed and secreted around the yolk inside this infundibulum.
This chalaza keeps the yolk properly positioned within the albumen.
The parts labeled II, III, and IV are not involved in producing the chalaza.
Therefore, the structure labeled I is where chalaza is formed.
Answer:A. I
