Allergies Questions in English

(D) During an allergic reaction,mast cells are activated and release chemical mediators into the surrounding tissues.
One of the primary chemicals released by mast cells is $Histamine$.
$Histamine$ acts as a potent vasodilator,meaning it causes the local arterioles (small blood vessels) to dilate (widen).
This dilation increases blood flow to the affected area,which contributes to the redness,swelling,and itching associated with allergic reactions like urticaria (hives).

(D) Hypersensitivity to certain antigens present in the environment is called an allergy. The substances to which such an immune response is produced are called allergens. Common examples of allergens include mites in dust,pollens,and animal dander.

(B) Allergy is an exaggerated response of the immune system to certain antigens present in the environment.
These substances,which trigger an allergic reaction,are called allergens.
Examples of common allergens include dust mites,pollen,and animal dander.
Therefore,the correct term for agents that produce allergy is allergens.

(D) Anaphylactic shock is a severe,potentially life-threatening allergic reaction that occurs rapidly after exposure to an allergen.
It is triggered by the massive release of chemicals,primarily histamines,from mast cells and basophils.
This systemic release leads to widespread vasodilation,a sudden drop in blood pressure,and constriction of airways,which are all manifestations of an acute allergic response.
Therefore,it involves an allergic reaction,the release of inflammatory mediators like histamines,and can be exacerbated by toxic components associated with the allergen.

(A) Antihistamines are drugs that block the action of histamine,a chemical released by the body during an allergic reaction. By binding to histamine receptors,they prevent the symptoms of allergies such as itching,sneezing,and swelling. Therefore,they are used to nullify allergic reactions.

(A) Allergy is an exaggerated response of the immune system to certain antigens present in the environment,which are called allergens.
This response is a result of the immune system reacting abnormally to substances that are generally harmless to most people.
Therefore,sensitivity to an allergen is a deviation from the normal process of immunity,where the body's defense mechanism overreacts.

(D) Allergy is an exaggerated response of the immune system to certain antigens present in the environment.
$Hay$ $fever$ (also known as allergic rhinitis) is a classic example of an allergic reaction caused by allergens like pollen grains.
Goitre is caused by iodine deficiency.
Enteric fever (typhoid) is a bacterial infection caused by $Salmonella$ $typhi$.
Skin cancer is caused by uncontrolled cell division often due to $UV$ radiation exposure.
Therefore,the correct option is $D$.

(A) Allergy is an exaggerated response of the immune system to certain antigens present in the environment.
During an allergic reaction,the body produces specific antibodies known as Immunoglobulin $E$ $(IgE)$.
These $IgE$ antibodies bind to mast cells and basophils,triggering the release of chemicals like histamine and serotonin,which cause the symptoms of an allergy.

(A) Allergy is an exaggerated response of the immune system to certain antigens present in the environment.
Asthma is a chronic respiratory condition often triggered by allergic reactions to allergens like pollen,dust mites,or animal dander.
Yellow eyes (jaundice) is a symptom of liver dysfunction.
Typhoid is a bacterial infection caused by $Salmonella$ $typhi$.
Mumps is a viral infection affecting the salivary glands.
Therefore,asthma is the correct example of an allergy.

(C) An allergy is an exaggerated response of the immune system to certain antigens present in the environment.
These antigens are called allergens.
The immune system produces $IgE$ antibodies in response to these allergens,leading to the release of chemicals like histamine and serotonin from mast cells,which cause allergic symptoms.
Therefore,the correct term for this hypersensitive reaction is Allergy.

(B) An allergy is an exaggerated response of the immune system to certain antigens present in the environment.
$Hay \ fever$ (also known as allergic rhinitis) is a classic example of an allergic reaction caused by allergens such as pollen grains,dust,or mold spores.
$Enteric \ fever$ (typhoid) is caused by the bacterium $Salmonella \ typhi$.
$Skin \ cancer$ is caused by uncontrolled cell division due to mutations,often linked to $UV$ radiation.
$Goitre$ is typically caused by an iodine deficiency.
Therefore,the correct option is $B$.

(B) Anaphylactic shock is a severe,potentially life-threatening allergic reaction that can occur rapidly after exposure to an allergen,such as bee venom or certain medications like penicillin.
It occurs when the immune system overreacts to the allergen,releasing a massive amount of chemicals like histamine,which leads to a sudden drop in blood pressure and narrowing of airways.
This condition is a medical emergency and is the most likely cause of death in the described scenario.

(C) Anaphylactic shock is a severe,potentially life-threatening allergic reaction that can occur within seconds or minutes of exposure to an allergen.
It causes the immune system to release a flood of chemicals that can cause the body to go into shock,where blood pressure drops suddenly and the airways narrow,blocking breathing.
Hay fever and asthma are also allergic reactions but are generally less severe and not immediately life-threatening compared to anaphylaxis.

(A) Allergic reactions are primarily mediated by $IgE$ antibodies.
When an allergen enters the body,it triggers the production of $IgE$ antibodies by plasma cells.
These $IgE$ antibodies bind to the surface of mast cells and basophils.
Upon subsequent exposure to the same allergen,the allergen binds to the $IgE$ on these cells,causing the release of chemicals like histamine and serotonin,which result in the symptoms of an allergy.

(D) Antihistamines are drugs that block the action of histamine,a chemical released by the body during an allergic reaction.
When an allergen enters the body,mast cells release histamine,which causes symptoms like sneezing,itching,watery eyes,and runny nose.
Antihistamines bind to histamine receptors,thereby preventing the allergic symptoms.
Therefore,they are effective in treating allergies.

(A) Allergies are the exaggerated response of the immune system to certain antigens present in the environment. The substances to which such an immune response is produced are called allergens. The antibodies produced to these are of $IgE$ type. Common examples of allergens are mites in dust,pollens,animal dander,etc. Symptoms of allergic reactions include sneezing,watery eyes,sneezing,difficulty in breathing,and rashes. The use of drugs like antihistamine,adrenaline,and steroids quickly reduces the symptoms of allergy.

(B) In India,$Parthenium$ (carrot grass) and $Amaranthus$ are well-known as major atmospheric allergens. Pollen grains of these plants are released in large quantities into the atmosphere and cause respiratory disorders such as asthma and bronchitis in susceptible individuals. Therefore,$Amaranthus$ is the correct option among the given choices.

(A) Allergies are caused by the release of chemicals like histamine and serotonin from mast cells.
To treat allergy symptoms,drugs like antihistamines,adrenaline,and steroids are commonly used to quickly reduce the symptoms.
Prostaglandins are lipid compounds that have diverse hormone-like effects in animals but are not used as drugs to treat allergies; in fact,some prostaglandins can even induce inflammation or allergic-like responses.

(C) Allergies are caused by the release of chemicals like histamine and serotonin from mast cells.
To reduce the symptoms of allergy,drugs like antihistamines,adrenaline,and steroids are used.
$1$. Antihistamines block the action of histamine.
$2$. Adrenaline is used to treat severe allergic reactions like anaphylactic shock.
$3$. Steroids reduce inflammation and immune response.
Interferons are proteins produced by virus-infected cells to protect non-infected cells from further viral infection; they are not used to treat allergies.

(B) Allergies are caused by the release of chemicals like histamine and serotonin from mast cells.
When an allergen enters the body,it triggers the immune system to release these inflammatory mediators,which lead to allergic symptoms such as sneezing,watery eyes,and skin rashes.
Therefore,$(i)$ Histamine and $(ii)$ Serotonin are the substances responsible for allergic reactions.

(B) Modern lifestyle,characterized by protected environments and reduced exposure to diverse antigens during early childhood,has led to a decrease in the development of natural immunity. This results in an increased sensitivity to allergens,which are substances that trigger an immune response (hypersensitivity) in the body. Consequently,many people in modern urban areas suffer from allergies like asthma or hay fever due to this heightened sensitivity.

(A) Allergies are the exaggerated response of the immune system to certain antigens present in the environment. Common symptoms of allergies include sneezing,watery eyes,running nose,and difficulty in breathing. Uncontrolled cell division is a characteristic feature of cancer,not an allergy.

(D) Allergies are caused by the release of chemicals like histamine and serotonin from mast cells.
$1$. Antihistamines are drugs that block the action of histamine,providing quick relief from allergy symptoms.
$2$. Adrenaline is used in severe allergic reactions (anaphylaxis) to rapidly counteract the effects of the allergic response.
$3$. Steroids (such as glucocorticoids) are used to reduce inflammation and suppress the immune response associated with chronic or severe allergies.
Therefore,all these drugs are used to manage and provide relief from allergies.

(D) Allergy is defined as the hypersensitive reaction of the immune system to certain antigens present in the environment,which are called allergens.
$1$. It is an exaggerated immune response to specific antigens (allergens).
$2$. It involves an abnormal physiological reaction of the body.
$3$. It is essentially a state of hypersensitivity to an allergen.
Therefore,all the given statements are correct.

(A) Allergy is the exaggerated response of the immune system to certain antigens present in the environment.
These antigens are called allergens.
Common examples of allergens include mites in dust,pollens,and animal dander.
The antibodies produced in response to these allergens are of the $IgE$ type.
Symptoms of allergic reactions include sneezing,watery eyes,running nose,and difficulty in breathing.

(C) In many developed cities in India,children are increasingly suffering from asthma and allergies. This is primarily due to high levels of air pollution,exposure to allergens in urban environments,and changes in lifestyle. Asthma is a chronic respiratory condition,and allergies are hypersensitive immune responses to environmental factors,both of which are prevalent in urban settings.

(C) Allergens are substances that trigger an exaggerated immune response. When an allergen enters the body,the immune system produces a specific type of antibody known as $IgE$ (Immunoglobulin $E$). These $IgE$ antibodies bind to mast cells and basophils,triggering the release of chemicals like histamine and serotonin,which cause the symptoms of an allergic reaction.

(C) To identify the specific allergen causing an allergic reaction,a procedure known as an allergy test is performed. In this process,a small dose of the suspected allergen is introduced into the patient's body (often via skin prick or intradermal injection). If the patient is allergic to that substance,it will trigger a localized immune response,such as redness or swelling,confirming the cause of the allergy.

(D) Allergic reactions are caused by the release of specific chemicals from mast cells when they encounter allergens.
These chemicals include $Histamine$ and $Serotonin$.
$Histamine$ causes vasodilation and increased capillary permeability,leading to symptoms like swelling,redness,and itching.
$Serotonin$ also acts as a mediator in inflammatory responses.
Therefore,the correct pair is $Histamine-Serotonin$.

(C) Allergies are the exaggerated response of the immune system to certain antigens present in the environment,known as allergens.
When an individual is exposed to allergens,the body produces specific antibodies to combat them.
$IgE$ antibodies are the primary immunoglobulins involved in allergic reactions.
An increased level of $IgE$ in the body indicates that the immune system is hypersensitive to specific allergens,thereby making the individual sensitive to them.

(C) An allergy is an exaggerated response of the immune system to certain antigens present in the environment.
Asthma is a classic example of an allergic reaction where the respiratory tract becomes inflamed and constricted in response to allergens like pollen,dust,or smoke.
Rheumatoid arthritis is an autoimmune disease,diabetes is a metabolic disorder,and dysentery is an infectious disease caused by bacteria or parasites.

(C) Mast cells are specialized cells of the immune system that release various chemical mediators during an allergic reaction. These mediators include histamine,serotonin,and heparin. Serotonin is a potent vasoconstrictor and is involved in the inflammatory response and allergic reactions. Therefore,it is associated with the manifestation of allergic symptoms.

(C) The substances to which the immune system exhibits an exaggerated response are called allergens. Common examples of allergens include dust mites,pollen,animal dander,and certain types of food. When these substances enter the body,they trigger the release of chemicals like histamine and serotonin from mast cells,resulting in allergic reactions.

(A) $IgE$ (Immunoglobulin $E$) is a type of antibody that plays a crucial role in the immune system's response to allergens. When an allergen enters the body,it triggers the production of $IgE$ antibodies. These antibodies bind to the surface of mast cells and basophils. Upon subsequent exposure to the same allergen,the allergen binds to the $IgE$ molecules on these cells,causing them to release chemicals like histamine and serotonin,which result in allergic symptoms.

(C) Allergies are caused by the release of chemicals like histamine and serotonin from the mast cells in the body.
To reduce the symptoms of allergy such as sneezing,watery eyes,and skin rashes,doctors prescribe drugs that block the action of histamine.
These drugs are known as Antihistamines.
Therefore,the correct option is $C$.

(D) Allergens are substances in the environment that cause an exaggerated immune response in sensitive individuals.
Common examples of allergens include:
$1$. Pollen grains: These are major airborne allergens causing hay fever.
$2$. Dust particles: These contain mites and other debris that trigger respiratory allergies.
$3$. Fungi: Spores of various fungi can cause allergic reactions.
$4$. Certain medicines: Drugs like penicillin can cause severe allergic reactions in some people.
$5$. Certain food items: Foods like peanuts,shellfish,or milk can act as allergens for specific individuals.
Therefore,all the listed options are correct examples of allergens.

(B) Allergies are caused due to the release of chemicals like $Histamine$ and $Serotonin$ from the mast cells.
To reduce the symptoms of allergy quickly,the drugs used are $Antihistamines$,$Adrenaline$,and $Steroids$.
$Antihistamines$ block the action of $Histamine$.
$Adrenaline$ is used in severe allergic reactions (like anaphylactic shock) to quickly counteract the effects.
$Steroids$ help in reducing inflammation and immune response.

(A) An allergy is a hypersensitive reaction of the immune system to certain antigens present in the environment.
When the immune system overreacts to harmless substances like dust,pollen,or dander,it releases chemicals such as histamine and serotonin from mast cells.
This exaggerated immune response leads to symptoms like sneezing,watery eyes,running nose,and difficulty in breathing.
Therefore,allergy is the correct answer.

(B) Allergic reactions are hypersensitive responses of the immune system to certain antigens present in the environment.
During an allergic reaction,the body produces specific antibodies known as $IgE$ (Immunoglobulin $E$).
These $IgE$ antibodies bind to mast cells and basophils,triggering the release of chemicals like histamine and serotonin,which cause the symptoms of an allergy.

(B) The exaggerated response of the immune system to certain antigens present in the environment is called $Allergy$. The substances to which such an immune response is produced are called $Allergens$. Common examples of allergens include mites in dust,pollens,and animal dander. Therefore,the correct option is $B$.

(C) Substances that cause an allergic reaction are known as $Allergens$.
Examples of common allergens include dust mites,pollen,animal dander,and certain food items.
When these substances enter the body of a sensitive individual,the immune system reacts abnormally,leading to the release of chemicals like histamine from mast cells,which causes the symptoms of an allergy.

(D) Allergies are hypersensitive reactions of the immune system to certain antigens present in the environment.
During an allergic reaction,the body produces a specific type of antibody known as $IgE$ (Immunoglobulin $E$).
These $IgE$ antibodies bind to mast cells and basophils,triggering the release of chemicals like histamine and serotonin,which cause the symptoms of an allergy.

(D) Allergy is an exaggerated response of the immune system to certain antigens present in the environment. The symptoms of allergic reactions include sneezing,watery eyes,running nose,and difficulty in breathing. These symptoms are caused by the release of chemicals like histamine and serotonin from the mast cells. Therefore,all the given options are correct symptoms of an allergy.

(B) Allergies are an exaggerated immune response to certain antigens present in the environment.
When an allergen enters the body,it triggers the production of $IgE$ antibodies.
These $IgE$ antibodies bind to the surface of $Mast$ cells and $Basophils$.
Upon subsequent exposure to the same allergen,these cells release chemicals like histamine and serotonin,which cause the symptoms of an allergic reaction.
Therefore,$Mast$ cells are directly associated with allergies.

(D) Allergies are caused by the release of specific chemicals from mast cells in response to allergens.
When an allergen enters the body,it triggers the mast cells to release chemicals such as histamine and serotonin.
These chemicals are responsible for the inflammatory response,which includes symptoms like itching,swelling,and redness associated with allergic reactions.
Therefore,both histamine and serotonin are involved in the allergic response.

(D) Allergies are caused by the release of chemicals like histamine and serotonin from mast cells.
Anti-allergen drugs are used to quickly reduce the symptoms of allergy.
$1$. Anti-histamines are commonly used to block the action of histamine.
$2$. Adrenaline is used in severe allergic reactions (anaphylaxis) to rapidly counteract the effects.
$3$. Steroids (like glucocorticoids) are used to suppress the immune response and reduce inflammation.
Therefore,all these drugs are used as anti-allergen treatments.

(A) The correct answer is $A$. During an allergic reaction,the body produces $IgE$ type of antibodies,not $IgM$. Therefore,the statement that $IgM$ antibodies are produced during an allergy is false. Mast cells release chemicals like histamine and serotonin,which cause allergic symptoms. Antihistamines,adrenaline,and steroids are commonly used to quickly reduce the symptoms of allergy. Modern lifestyle,characterized by high hygiene and reduced exposure to pathogens,has been linked to an increase in sensitivity and a decrease in natural immunity,leading to more allergic reactions.

(A) The assertion $(S)$ is true because children in developed cities are exposed to a more sanitized environment,which reduces their exposure to antigens early in life,leading to higher rates of allergies.
The reason $(R)$ is also true because modern lifestyles,characterized by excessive hygiene and reduced exposure to natural environments,lead to a lower development of the immune system,making individuals more susceptible to hypersensitivity reactions (allergies).
Therefore,$R$ correctly explains $S$.

(B) The correct answer is $B$.
Antihistamines,Adrenaline,and Steroids are all commonly used to quickly reduce the symptoms of an allergy.
Antihistamines block the action of histamine,Adrenaline counteracts the effects of anaphylaxis by constricting blood vessels and relaxing airway muscles,and Steroids reduce inflammation associated with allergic reactions.
Other options contain a mix of diseases (Hepatitis $B$,Tetanus) and chemicals,making them inconsistent groups.

(A) Allergies are exaggerated responses of the immune system to certain antigens present in the environment.
When an allergen enters the body,it triggers the immune system to produce $IgE$ antibodies.
These antibodies bind to the surface of mast cells.
Upon subsequent exposure to the same allergen,the mast cells release chemicals such as $Histamine$ and $Serotonin$.
$Histamine$ is the primary chemical responsible for the acute inflammatory response,including symptoms like sneezing,watery eyes,and difficulty breathing,which are characteristic of an allergic reaction.