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CNMS ICSE - 7 Std
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Answers to textbook exercises

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Chapter: 08. Allergy

⁠

Check Point

Write True or False.
Allergy is an exaggerated reaction of immune system.
Answer: Allergy (The statement is filled in as: Allergy is an exaggerated reaction of immune system.)
Hay fever is also called allergic rhinitis.
Answer: rhinitis (The statement is filled in as: Hay fever is also called allergic rhinitis.)
In allergic persons, first exposure to an allergen does not cause allergy.
Answer: allergy / symptoms (The statement is filled in as: In allergic persons, first exposure to an allergen does not cause allergy.)
Allergy shots are helpful to keep seasonal allergies under control.
Answer: shots (The statement is filled in as: Allergy shots are helpful to keep seasonal allergies under control.)
⁠

Test Yourself

A. Multiple Choice Questions
Pet dander is
Answer: (d) Microscopic particles on skin
Allergies can be best defined as
Answer: (b) Overreaction from the immune system to a foreign substance
The drugs used to treat allergic reactions are called
Answer: (b) Antihistamines
Gluten is allergy to
Answer: (a) Wheat
Common term for urticaria is
Answer: © Hives
The cells that are responsible for allergy
Answer: (a) Mast cells
B. Assertion-Reason Type Questions
Assertion [A]: Substances that cause allergy are called allergens. ​Reason [R]: Allergens cause the immune system to become hyperactive producing more histamine.
Answer: (a) Both Assertion [A] and Reason [R] are true.
Assertion [A]: Red and itchy rashes that develop in the skin of certain people are symptoms of urticaria. ​Reason [R]: It is caused due to sap of certain plants like oak.
Answer: (b) Both Assertion [A] and Reason [R] are false. (Urticaria/hives is characterized by swollen, pale-red bumps or patches, and plant sap typically causes contact dermatitis. Therefore, both statements are incorrect descriptions/associations.)
Assertion [A]: Quantitative measurement of specific IgE antibodies in the blood is essential. ​Reason [R]: Antibodies assessment in the blood helps the doctor to predict the type of allergy and the risk of severe allergic reaction.
Answer: (a) Both Assertion [A] and Reason [R] are true.
C. State whether these statements are true or false. If false, rewrite the correct form of statements.
Anaphylaxis is a basic reaction to a simple allergen.
Answer: False. ​Correct Statement: Anaphylaxis is a sudden, severe, and the most dangerous of all allergic reactions.
Hay fever is an allergic reaction.
Answer: True.
Allergies can cause conjunctivitis.
Answer: True.
Pollen is responsible for perennial allergy.
Answer: False. ​Correct Statement: Pollen is responsible for seasonal allergy.
Allergies are mainly diagnosed by symptoms.
Answer: False. ​Correct Statement: Allergies are mainly diagnosed by tests (such as skin-prick tests and blood tests).
Cosmetic allergy is a seasonal allergy.
Answer: False. ​Correct Statement: Cosmetic allergy is a perennial or contact allergy (non-seasonal).
D. Give one word for the following.
Substances that cause allergy
Answer: Allergens
The body system that is responsible for manifestation of allergy symptoms
Answer: Immune system
The allergic reaction which is characterised by wheezing and breathlessness
Answer: Allergic Asthma
The sudden, severe allergic reaction resulting in decreased blood pressure and threat to life
Answer: Anaphylaxis (or Anaphylactic shock)
E. Define the following.
Anaphylaxis
Answer: Anaphylaxis is a sudden, severe, and highly dangerous allergic reaction characterized by a massive release of histamine, leading to widespread skin rashes, swelling of the face, tongue, and throat, shortness of breath, and a drastic drop in blood pressure that can be life-threatening.
Hyperactivity
Answer: In the context of allergy, hyperactivity is the overactive or hypersensitive state of the immune system where it overreacts to foreign substances (allergens) that are normally harmless to most people.
Immune system
Answer: The immune system is the biological defense network of the body that protects it against infections, harmful foreign invaders (such as viruses, bacteria, and foreign proteins), and toxic substances.
F. Match the columns.
Column A
Column B
1. Dust
(e) Asthma
2. Animal fur
(b) Coughing
3. Pollen grains
(d) Sneezing
4. Eggs
(a) Vomiting
5. Strong sunlight
© Skin rashes
⁠
Answer Matches:
1 matches (e)
2 matches (b)
3 matches (d)
4 matches (a)
5 matches ©
G. Answer these questions.
List the symptoms of seasonal allergies.
Answer: The common symptoms of seasonal allergies are:
Sneezing
Coughing
Runny nose
Itchy and watery eyes
General body ache
Define seasonal and perennial allergy.
Answer:
Seasonal Allergy: An allergy that develops only during specific seasons of the year and disappears when the season changes. Examples include spring allergy caused by pollen grains.
Perennial Allergy: An allergy that can appear at any time and persists year-round, typically triggered by indoor allergens such as dust mites, mold, pet dander, or foods.
What methods are used to identify the causative allergen?
Answer: The two primary diagnostic methods used are:
Skin-prick Test (Prick/Puncture Testing): Small amounts of allergen extracts are injected intradermally into the patient’s skin. The site is monitored for redness and inflammatory swelling to identify the sensitivity.
Blood Test: This test detects the presence of allergens by measuring the concentration of specific IgE antibodies in the patient’s blood.
Name three entry routes of allergens in human body.
Answer: The three entry routes of allergens into the body are:
Nose (through breathing / inhalation)
Mouth (by eating / ingestion)
Skin (by contact)
What are allergens? Name any three allergens that are responsible for food allergy.
Answer: Allergens are foreign substances that trigger an exaggerated or overactive reaction from the immune system. Three common allergens responsible for food allergy are:
Milk (containing the protein casein)
Wheat (containing gluten)
Eggs (or nuts, fish, shellfish, and soy)
H. Complete the following words:
An air-borne allergen. ​P O L L E N
Answer: POLLEN (or SPORE)
An allergic reaction in which patient suffers from sneezing, coughing, running nose and watery eyes. ​H A Y F E V E R
Answer: HAY FEVER
I. Case-based Questions
Difficulty in breathing, and symptoms like coughing and wheezing are due to
Answer: (a) Asthma
Ritika is suffering from
Answer: (a) Seasonal allergy
Asthma is caused due to
Answer: © Dust particles in the air
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