Question

Assertion :Mast cells in the human body release excessive amounts of inflammatory chemicals which cause allergic reactions. Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Mast cells in the human body are associated with secreting a chemical substance called histamine. Histamine is an inflammatory chemical that can cause allergic reactions in the body in response to allergens (allergy causing substance). Hence, assertion is correct.

When allergens enter the body, they stimulate mast cells which initiate the arrival of leucocytes i.e. white blood cells, at the site of infection. As a result, histamine is released from the mast cells which cause allergic reaction in the body. Hence, reason is also true and is correct explanation for assertion.

So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.