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Allergy

Solutions for Biology, Class 7, ICSE

Long Answer Questions

2 questions

Question 1

Name any three routes by which allergens normally enter in our body.

Long Answer Questions

Answer:

Three routes by which allergens normally enter in our body are:

  1. Skin
  2. Mouth
  3. Nose

Question 2

Name the two tests generally used to diagnose allergy and describe any one of them.

Long Answer Questions

Answer:

The two tests generally used to diagnose allergy are:

  1. Skin prick test.
  2. Blood testing

Blood testing — A sample of patient's blood is sent to a laboratory for analysis. Multiple allergens can be detected with a single blood sample. The test measures the concentration of specific antibodies in the blood. The quantitative allergy blood result can help determine what a patient is allergic to, help predict and follow the disease development, estimate the risk of a severe reaction, and explain cross-reactivity.

Objective Type Questions

9 questions

Question 1(i)

As a response to allergens, the body produces a chemical called :

  1. Histones
  2. Antigen
  3. Histamine
  4. Antibody
Objective Type Questions

Answer:

Histamine

Reason — The body produces Histamine in response to allergens, which leads to allergic symptoms like inflammation, skin rash and constriction of the bronchioles (as in asthma).

Question 1(ii)

The kind of proteins produced in our body against the allergens are called as :

  1. Antigens
  2. Immunoglobulins
  3. Both (1) and (2)
  4. Neither (1) nor (2)
Objective Type Questions

Answer:

Immunoglobulins

Reason — In an attempt to protect our body from these allergens, our immune system produces immunoglobulin proteins that are specific to the allergen.

Question 1(iii)

Which of the following is not an allergic reaction ?

  1. Asthma
  2. Anaemia
  3. Skin rashes
  4. Dermatitis
Objective Type Questions

Answer:

Anaemia

Reason — Anaemia is a condition where the body does not have enough red blood cells. It is not triggered by the body's immune system's response to an allergen.

Question 1(iv)

A systemic allergic response is termed as :

  1. Prophylaxis
  2. Asphyxiation
  3. Anaphylaxis
  4. Hypoxia
Objective Type Questions

Answer:

Anaphylaxis

Reason — A systemic allergic response is termed as Anaphylaxis.

Question 1(v)

Which of the following is not the entry route of allergens ?

  1. Skin
  2. Nose
  3. Mouth
  4. Ears
Objective Type Questions

Answer:

Ears

Reason — Allergens usually enter our body through skin, nose and mouth, but not through ears.

Question 2

Name the following :

  1. The scientist who coined the term 'allergy'.
  2. The allergic reaction/ disease in which the lining of the nasal cavity becomes sensitive and inflamed.
  3. The term used for an exaggerated reaction of the immune system to a substance that most other people do not react to.
  4. The kind of allergic disease in which the muscular walls of the bronchioles contract and get narrower.
  5. The inflammatory chemical which upon its release shows allergic symptoms such as inflammation, skin rash and construction of bronchioles.
Objective Type Questions

Answer:

  1. Clemens Von Pirquet
  2. Hay fever
  3. Allergy
  4. Asthma
  5. Histamine

Question 3

Match the terms given in column A with those of column B :

Column AColumn B
(i) Food allergens(a) Penicillin and Aspirin
(ii) Winter seasonal allergy(b) Skin prick test, blood test
(iii) Dust allergy(c) Hay fever, asthma
(iv) Allergic reaction(d) Milk and sea food
(v) Diagnosis of allergy(e) Sulphur dioxide and nitrogen dioxide
Objective Type Questions

Answer:

Column AColumn B
(i) Food allergens(d) Milk and sea food
(ii) Winter seasonal allergy(e) Sulphur dioxide and nitrogen dioxide
(iii) Dust allergy(c) Hay fever, asthma
(iv) Allergic reaction(a) Penicillin and Aspirin
(v) Diagnosis of allergy(b) Skin prick test, blood test

Question 4

Fill in the blanks :

  1. ............... allergy mainly occurs in the spring season.
  2. A weak ............... system makes our body prone to allergies.
  3. Our body produces a chemical called ............... as a response to allergens.
  4. Milk-protein allergies are most common in ............... .
  5. Bloating and vomiting are the symptoms of ............... allergy.
Objective Type Questions

Answer:

  1. Pollen
  2. Immune
  3. Histamine
  4. Children
  5. Food

Question 5

Unjumble the following words :

  1. ALERLEGSN
  2. ATGNINE
  3. PLNOLE
  4. ARGLYLE
  5. HVSIE
  6. HSMAITNEI
  7. AAHILANPYXS
  8. AAMHTS
  9. IYINUMTM
  10. IONITMANAFLM
Objective Type Questions

Answer:

  1. ALERLEGSN → ALLERGENS
  2. ATGNINE → ANTIGEN
  3. PLNOLE → POLLEN
  4. ARGLYLE → ALLERGY
  5. HVSIE → HIVES
  6. HSMAITNEI → HISTAMINE
  7. AAHILANPYXS → ANAPHYLAXIS
  8. AAMHTS → ASTHMA
  9. IYINUMTM → IMMUNITY
  10. IONITMANAFLM → INFLAMMATION

Short Answer Questions

3 questions

Question 1

Define the term "allergy".

Short Answer Questions

Answer:

Allergy is defined as a number of conditions caused by hypersensitivity of one's immune system to allergens like dust, spores, pollen, insect stings, certain types of food and cloth, etc.

Question 2

What are allergens ? Name any three allergens.

Short Answer Questions

Answer:

The substances that cause allergies are called allergens. Three common allergens are:

  1. Dust
  2. Spores
  3. Insect sting

Question 3

Which test is mostly favoured for testing allergy, prick test or blood test ? Why ?

Short Answer Questions

Answer:

Blood test is mostly favoured for testing allergy. An allergy blood test is quick and simple, and can be ordered by a licensed health care provider. Unlike skin-prick testing, a blood test can be performed irrespective of age, skin condition, medication, symptom, disease activity, and pregnancy. Thus, we can say that blood test is a better test as compared to prick test.