Define Allergy.Give any two symptoms of Allergic reactions.

What are symptoms of allergic reactions?

In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem. Give some symptoms of allergic reactions.

Give any two examples of ferns.

Give any two uses of gypsum?

Give any two examples of xerarch succession.

Give two examples of decompositon reaction.

Which antibody initiates allergic reaction