Question

IgA immunity provided to a baby at birth is called:

• A. Active immunity
• B. Passive immunity
• C. Artificial immunity
• D. Innate immunity

Hint:

\[ \boxed{\text{Mother → Baby antibodies = Passive immunity}} \] IgA in colostrum provides temporary protection to newborns.

Answer 1

The Correct Option is B

Concept: Immunity can be classified based on how it is acquired:

• Active immunity – Body produces its own antibodies.

• Passive immunity – Ready-made antibodies are transferred from another source.
A newborn baby receives antibodies (including IgA) from the mother through breast milk and placenta.

Step 1: Understand IgA transfer.
IgA antibodies are mainly present in colostrum and breast milk. These antibodies provide immediate protection to the newborn. \[ \boxed{\text{Maternal antibodies transferred to baby}} \]

Step 2: Identify type of immunity.
Since the baby does not produce these antibodies itself, but receives them externally: \[ \boxed{\text{It is Passive immunity}} \]

Step 3: Select correct option.
Hence, \[ \boxed{\textbf{Option (B)}} \] is correct.