Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains :
- Macrophages
- Immunoglobulin A
- Natural killer cells
- Monocytes
Answer
(2) Immunoglobulin A
Solution
As per NCERT, the yellowish fluid colostrum secreted by the mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.
This is an example of passive immunity, as ready-made antibodies are given to the infant.
Answer: (2)