• Why Do We Fall Ill? (Class IX)
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Why Do We Fall Ill? (Class IX)

Description: Why Do We Fall Ill
Number of Questions: 20
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Tags: Why Do We Fall Ill IX Biology Deforestation: Causes and Consequences Infrastructure for Conservation of Flora & Fauna Flora and Fauna: The Need to Conserve Deforestation: Prevention & Reversal Infectious Diseases and Causative Agents
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Intrinsic factors are those disease-causing factors that exist within the human body. Which of the following is/are a disease-causing intrinsic factor?

  1. Microorganisms

  2. Inadequate diet

  3. Pollutants in the environment

  4. Narcotic drugs

  5. Hormonal imbalances

Show answer
Correct Option: E
Explanation:

This is the correct option. Hormonal imbalances are a disease-causing intrinsic factor. They cause diseases such as thyroid.

Degenerative diseases are those diseases in which the organs and tissues wear away and do not work so well with age. Which of the following is a degenerative disease?

  1. Haemophilia

  2. Paranoia

  3. Kwashiorkor

  4. Arthritis

  5. Cystic fibrosis

Show answer
Correct Option: D
Explanation:

This is the correct option. Arthritis is a degenerative disease.

Which of the following diseases are caused due to the hyposecretion of hormones?

a. Addison's disease b. Diabetes mellitus c. Myxoderma d. Grave's disease

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only b and d

  5. Only a and d

Show answer
Correct Option: A
Explanation:

This is the correct option. Addison's disease and diabetes mellitus are caused due to the hyposecretion of hormones. Addison's disease is caused due to hyposecretion of aldosterone hormone. Diabetes mellitus is caused due to hyposecretion of insulin.

The deficiency of vitamin A causes the disease known as

  1. bleeding disease

  2. rickets

  3. scurvy

  4. night blindness

  5. beri-beri

Show answer
Correct Option: D
Explanation:

This is the correct option. The deficiency of vitamin A causes the disease known as night blindness.

Which of the following is not a property of communicable diseases?

  1. They are brought about by external factors.

  2. They cannot pass from one person to another.

  3. Transmission of infection occurs through direct contact or some medium.

  4. Community hygiene can reduce the incidence of these diseases.

  5. These diseases are caused by attack of pathogens.

Show answer
Correct Option: B
Explanation:

This is the correct option as this is not a property of communicable diseases. They can pass from one person to another.

Match the following:

 
Deficient nutrient Disease
a. Iron 1. Kwashiorkor
b. Iodine 2. Goitre
c. Protein 3. Microcytic anaemia

  1. a - 1, b - 2, c - 3

  2. a - 3, b - 2, c - 1

  3. a - 2, b - 3, c - 1

  4. a - 1, b - 3, c - 2

  5. a - 3, b - 1, c - 2

Show answer
Correct Option: B
Explanation:

This is the correct option. The deficiency of iron causes microcytic anaemia. The deficiency of iodine causes goitre. The deficiency of protein causes kwashiorkor.

Which of the following statements is/are false?

a. Interferons are secreted by the microphages of human body to combat viruses. b. Antibodies are the chemicals produced by bacteria and fungi to kill the pathogen. c. Diseases that are caused by microbes are called non-infectious diseases.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option as this statement is false. Diseases that are caused by microbes are called infectious diseases.

Which of the following are non-communicable diseases?

a. Tuberculosis b. Hypertension c. Chickenpox d. Goitre

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only b and d

  5. Only a and d

Show answer
Correct Option: D
Explanation:

This is the correct option. Hypertension and goitre are non-communicable diseases.

Which of the following infectious agents cause tetanus?

  1. Viruses

  2. Protozoa

  3. Fungi

  4. Worms

  5. Bacteria

Show answer
Correct Option: E
Explanation:

This is the correct option. Tetanus is caused by a bacterium.

Which of the following statements is/are false?

a. All viruses live inside host cells whereas bacteria very rarely do so. b. Worms multiply very quickly whereas bacteria, viruses and fungi multiply very slowly. c. Most broad spectrum antibodies work against many species of bacteria.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. Bacteria, viruses and fungi multiply very quickly whereas worms multiply very slowly.

In which of the following diseases are viruses the infectious agents?

  1. Influenza

  2. Cholera

  3. Ringworm

  4. Kala-azar

  5. Elephantiasis

Show answer
Correct Option: A
Explanation:

This is the correct option. In influenza, viruses are the infectious agents.

Direct transmission and indirect transmission are the two means of transmission of infectious diseases. Which of the following diseases spread through indirect transmission?

a. Tetanus b. Hepatitis c. Amoebiasis d. Rabies

  1. Only a and b

  2. Only b and d

  3. Only b and c

  4. Only a and c

  5. Only a and d

Show answer
Correct Option: C
Explanation:

This is the correct option. Hepatitis and amoebiasis spread through indirect transmission. These diseases spread through contaminated food and water.

Match the following:

 
a. Chronic diseases 1. These are those diseases that are caused due to genetic abnormalities, metabolic disorders or malfunctioning of an organ.
b. Infectious diseases 2. These are those diseases that are long-term with symptoms lasting months.
c. Congenital diseases 3. These are those diseases that are caused by some biological agents.

  1. a - 1, b - 2, c - 3

  2. a - 1, b - 3, c - 2

  3. a - 2, b - 3, c - 1

  4. a - 3, b - 2, c - 1

  5. a - 2, b - 1, c - 3

Show answer
Correct Option: C
Explanation:

This is the correct option. Chronic diseases are those diseases that are long-term with symptoms lasting months. Infectious diseases are those diseases that are caused by some biological agents. Congenital diseases are those diseases that are caused due to genetic abnormalities, metabolic disorders or malfunctioning of an organ.

Which of the following B-lymphocytes are responsible for secreting antibodies into the blood circulation?

a. Plasma B-cells b. Memory B-cells c. Dividing B-cells

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option. Plasma B-cells, a form of B-lymphocytes, secrete antibodies into the blood circulation.

Match the following:

 
Disease transmitted Insect vector
a. Bubonic plague 1. Rat flea
b. Epidemic typhus 2. Sandfly
c. Kala-azar 3. Louse

  1. a - 1, b - 2, c - 3

  2. a - 3, b - 2, c - 1

  3. a - 3, b - 1, c - 2

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 3, c - 1

Show answer
Correct Option: D
Explanation:

This is the correct option. Bubonic plague is transmitted through rat flea. Epidemic typhus is transmitted through louse. Kala-azar is transmitted through sandfly.

Which of the following drugs is/are recommended for the treatment of influenza?

a. Amantadine b. Rifampicin c. Rimantidine

  1. Only a

  2. Only a and b

  3. Only a and c

  4. Only b and c

  5. Only b

Show answer
Correct Option: C
Explanation:

This is the correct option. Amantadine and rimantidine are the drugs that are recommended for the treatment of influenza.

The symptoms of which of the following diseases are swollen lymph nodes, regular fever, sweating at night and weight loss?

  1. Polio

  2. AIDS

  3. Malaria

  4. Influenza

  5. Diarrhoea

Show answer
Correct Option: B
Explanation:

This is the correct option. The symptoms of AIDS are swollen lymph nodes, regular fever, sweating at night and weight loss.

Which of the following is a nematode that causes diarrhoea?

  1. Escherichia coli

  2. Norwalk

  3. Entamoeba histolytica

  4. Ascariasis

  5. Balantidium coli

Show answer
Correct Option: D
Explanation:

This is the correct option. Ascariasis is a nematode that causes diarrhoea.

Match the following:

 
Disease(s) Vaccine
a. Tuberculosis 1. Polio
b. Poliomyelitis 2. DPT-Hib
c. Diphtheria, Tetanus, Pertussis and Haemophilus influenzae type B 3. BCG

  1. a - 3, b - 1, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 1, c - 3

Show answer
Correct Option: A
Explanation:

This is the correct option. The vaccine for tuberculosis is BCG. The vaccine for poliomyelitis is polio. The vaccine for Diphtheria, Tetanus, Pertussis and Haemophilus influenzae type B is DPT-Hib.

Match the following:

 
Disease Causative agent
a. Typhoid 1. Myxovirus influenza
b. Malaria 2. Plasmodium
c. Influenza 3. Salmonella typhi

  1. a - 3, b - 1, c - 2

  2. a - 1, b - 3, c - 2

  3. a - 2, b - 3, c - 1

  4. a - 1, b - 2, c - 3

  5. a - 3, b - 2, c - 1

Show answer
Correct Option: E
Explanation:

This is the correct option. The causative agent for typhoid is Salmonella typhi. The causative agent for malaria is Plasmodium. The causative agent for influenza is Myxovirus influenza.

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