Question

Given below are two statements:
Statement I: IgA are secretory antibodies
Statement II: IgM are natural antibodies
In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Hint:

Remember: IgA guards mucosal surfaces, while IgM is the first line of antibody defense and exists naturally in the blood.

Answer 1

The Correct Option is A

IgA antibodies are primarily found in mucosal secretions such as saliva, tears, and breast milk, playing a key role in mucosal immunity, hence called secretory antibodies. IgM antibodies, on the other hand, are the first antibodies produced during an immune response and are also known as natural antibodies because they are present in the body without previous infection or vaccination, helping in early defense.