Question
- Which agents cause allergy?
- How does the human body respond to allergens?
✓
Answer
- The exaggerated or hypersensitive response of the immune system to certain agents in the environment is called allergy and its causing elements are called allergens.
- Symptoms of allergic reaction includes sneezing, watery eyes, rashes, running nose, difficulty in breathing, etc. Allergy occurs due to the release of chemicals like histamine and serotonin from the mast cells. Drugs like anti-histamine, adrenaline and steroids quickly reduce the symptoms of allergy.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What does the following equation represent? Explain.
$p^2+ 2 pq + q^2 = 1$
→$p^2+ 2 pq + q^2 = 1$
One of the twins born to parents having normal colour vision was colour blind whereas the other twin had normal vision. Work out the cross. Give two reasons how it is possible.
Describe the process of sporulation seen in Amoeba.
Since October 02, 2014 'Swachh Bharat Abhiyan' has been launched in our country.
- Write your views on this initiative giving justification.
- As a biologist name two problems that you may face while implementing the programme in your locality.
- Suggest two remedial methods to overcome these problems.
List any four symptoms shown by Klinefelter’s syndrome sufferer. Explain the cause of this disease.
What can you say about species diversity A and B?
Give reasons : The UV radiations are injurious.
Match the column A with B and rewrite correct pairs.
| A | B | ||
| 1. | citric acid | a) | in medicine for solubility of Ca++ |
| 2. | fumaric acid | b) | confectionary |
| 3. | gluconic acid | c) | in resins as wetting agents |
Eosinophils and Basophils.
Double fertilisation is reported in plants of both, castor and groundnut. However, the mature seeds of groundnut are non-albuminous and castor are albuminous. Explain the post-fertilisation events that are responsible for it.