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Why Do We Fall Ill (Class IX)

Description: Biology
Number of Questions: 15
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Tags: Biology Why do we fall ill IX Science Infectious Diseases and Causative Agents Why Do We Fall Ill Effect of Disease on Human Body Principles of Treatment of Diseases
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Which of the following is not a bacterial disease?

  1. Typhoid

  2. Tuberculosis

  3. Diptheria

  4. Tetanus

  5. Athlete's foot

Show answer
Correct Option: E
Explanation:

Fungi grow best in warm, moist areas, such as the area between the toes. Athlete's foot is a fungal disease. This is the correct answer.

Which of the following statements is/are correct?

a. Congenital diseases occur due to genetic disorders. b. Allergies are caused by external substances such as dust, pollen food etc. c. Degenerative diseases are caused by the infections caused by external substances.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. b only

Show answer
Correct Option: B
Explanation:

This is the correct answer as both statements are correct. Congenital diseases occur due to genetic disorders. Allergies are caused by external substances such as dust, pollen food etc.

Which of the following diseases is/are viral?

a. AIDS b. Influenza c. Dengue fever

  1. Only a

  2. Only b

  3. Only c

  4. a, b and c

  5. a and b

Show answer
Correct Option: D
Explanation:

This is the correct answer as AIDS is caused by the Human Immunodeficiency Virus. Influenza is caused by Influenzavirus A. The dengue virus (DENV) is the cause of dengue fever.

Which of the following diseases is not chronic?

  1. Asthma

  2. Epilepsy

  3. Hypertension

  4. Peptic ulcers

  5. Schizophrenia

Show answer
Correct Option: D
Explanation:

This is the correct answer as Marshall and Warren, awarded the Nobel Prize for the cure of peptic ulcer disease,  discovered that it is a disease that can be cured by a short period of treatment with antibiotics.

Which of the following statements is/are correct?

a. All disease-causing viruses and bacteria live inside host cells. b. Viruses, bacteria and fungi multiply very quickly, while worms multiply very slowly in comparison. c. Antibiotics work by blocking biochemical pathways important for bacteria.

  1. a only

  2. b only

  3. c only

  4. b and c

  5. a, b and c

Show answer
Correct Option: D
Explanation:

This is the correct answer as statements b and c are correct.

STDs caused by bacteria or parasites can be treated with antibiotics or other medicines but STDs caused by viruses cannot be cured. Which of the following STDs is/are caused by viruses?

  1. Chlamydia

  2. Syphilis

  3. Gonorrhea

  4. Herpes

  5. None of these

Show answer
Correct Option: D
Explanation:

This is the correct answer as herpes is caused by herpes simplex virus. There is no cure for this. Once a person has the virus, it remains in the body. The virus lies inactive in the nerve cells until something triggers it to become active again.

Which of the following statements is/are correct about interferon?

a. It is an antiviral protein. b. It is a broad spectrum antibiotic. c. The body needs to be given interferon intravenously.

  1. Only a

  2. a and b

  3. a and c

  4. b and c

  5. c only

Show answer
Correct Option: A
Explanation:

This is the correct answer as interferon is an antiviral protein secreted by the human body to fight viral infections.

Which of the following statements correctly define(s) inflammation?

a. The damage to the body's immune system upon being hit by a disease is called inflammation. b. The recruitment of many cells to the affected tissue to kill off the disease-causing microbe is called inflammation. c. The local effects on the body such as swelling and pain, and general effects such as fever are called inflammation.

  1. a only

  2. b only

  3. c only

  4. a and c

  5. b and c

Show answer
Correct Option: E
Explanation:

This is the correct answer as both statements are correct.

Which of the following is/are correct about tuberculosis?

a. It is caused by Salmonella. b. It commonly affects lungs. c. Bacteria release tuberculin toxin. d. Patient's sputum contains blood.

  1. a, b, c and d

  2. a, b and c

  3. a, c and d

  4. a, b and d

  5. b, c and d

Show answer
Correct Option: E
Explanation:

This is the correct answer as all these statements about tuberculosis are correct. It commonly affects lungs. Bacteria release tuberculin toxin. Patient's sputum contains blood.

Which of the following is/are the cause(s) of AIDS?

a. Sexual intercourse b. Blood transfusion c. Placental transfusion

  1. a and b

  2. a and c

  3. b and c

  4. a only

  5. a, b and c

Show answer
Correct Option: E
Explanation:

This is the correct answer as AIDS is caused by either of the three. It can be caused by sexual intercourse, blood transfusion or can be passed on by an AIDS-affected mother to her unborn child.

Match the following:

Causative agent Disease
a. Staphylococci 1. Sleeping sickness
b. Trypanosoma 2. Kala-azar
c. Leishmania 3. Acne

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

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

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

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

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

Show answer
Correct Option: E
Explanation:

The correct matching is given below. Staphylococci : the bacteria that can cause acne Trypanosoma : the protozoan that causes sleeping sickness Leishmania : the protozoan that causes kala-azar

In modified toxin vaccines, toxoids produced by the bacteria are made harmless. They are used to stimulate antibody production, but there is no risk of infection by the pathogen. Vaccines against which of the following diseases are modifed toxins?

a. BCG b. Polio c. Diphtheria d. Tetanus

  1. a, b and c

  2. a, b and d

  3. a, c and d

  4. a and b

  5. c and d

Show answer
Correct Option: E
Explanation:

This is the correct answer. 

Which of the following statements is/are correct about congenital diseases?

a. They are caused by deficiency of nutrients. b. They are characterized by a condition existing at or before birth, regardless of the cause. c. They can be vaccinated against by providing active acquired immunity.

  1. a and c

  2. b and c

  3. a only

  4. b only

  5. c only

Show answer
Correct Option: D
Explanation:

This is the correct answer as congenital diseases are characterized by a condition existing at or before birth, regardless of cause.

Which of the following statements is/are correct about polio?

a. Polio is caused by metabolic disorders in an infant. b. Legs become paralysed due to polio. c. Pulse Polio Immunisation Programme was launched in 1995-96 in India.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. b only

Show answer
Correct Option: D
Explanation:

This is the correct answer as polio paralyses the legs. Also, the Pulse Polio Immunisation Programme was launched in 1995-96 in India.

Match the following:

   
Disease Point of entry Target organ/tissue
a. HIV 1. Mosquito bite A. Brain
b. Typhoid 2. Sexual organs B. Gut lining
c. Japanese encephalitis 3. Mouth C. Lymph nodes

  1. a - 1 - A, b - 2 - B, c - 3 - C

  2. a - 1 - B, b - 3 - C, c - 2 - A

  3. a - 2 - C, b - 3 - B, c - 1 - A

  4. a - 2 - B, b - 1 - A, c - 3 - C

  5. a - 2 - C, b - 1 - A, c - 3 - B

Show answer
Correct Option: C
Explanation:

HIV enters through sexual organs and reaches lymph nodes all over the body. Typhoid enters through the mouth and stays in the gut lining. Japanese encephalitis enters through mosquito bite and affects the brain.

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