The type of antibodies that produce the immune response in the presence of allergens like pollen, dust, animal dander etc. is _____.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → IgE
Option (1) IgA — Incorrect. IgA is found in body secretions. The colostrum, the yellowish milk a mother gives in the first days, has plenty of IgA that protects the newborn. It plays no part in allergy.
Option (2) IgE — Correct. IgE binds to mast cells. When the allergen comes again, these cells release chemicals like histamine and serotonin, which cause sneezing, watery eyes and difficulty in breathing.
Option (3) IgM — Incorrect. IgM is the first antibody made when the body meets a pathogen for the first time. It fights infection and is not the antibody of allergy.
Option (4) IgG — Incorrect. IgG is the most common antibody in the blood. It can cross the placenta and protect the foetus, but it does not cause the allergic response.
NCERT Extract:
Allergies –
