In the chapter “Why Do We Fall Ill?” from Class 9 Science, students delve into the reasons behind illnesses and the measures to prevent them. This topic is an essential part of the curriculum, as it educates young learners about the various types of diseases and how they impact human health. The chapter explains how illnesses can be caused by tiny, invisible germs or by poor health practices and unfavorable living conditions.
The section on Class 9 Science Why do we fall ill mcq includes questions about infectious and non-infectious diseases. Infectious diseases are those that can spread from one person to another, such as colds and flu. Non-infectious diseases, like diabetes and heart conditions, do not spread from person to person but can be influenced by genetics and lifestyle choices. The curriculum also highlights how our environment and daily habits can play a significant role in either promoting health or contributing to disease.
The multiple-choice questions (MCQs) provided under Class 9 Science Why do we fall ill mcq are designed to test students’ understanding of how diseases are transmitted, how the body defends itself against pathogens, and effective strategies for disease prevention. These questions help students apply their knowledge in practical scenarios, enhancing their ability to make informed decisions about their health and well-being.
Why do we fall ill Class 9 MCQs
Ques. Which disease is caused by a protozoan?
a) Typhoid
b) Common Cold
c) AIDS
d) Malaria
Answer: d)
Ques. Which of these diseases is caused by fungi?
a) Skin infection
b) Cold and cough
c) AIDS
d) Malaria
Answer: a)
Ques. What type of disease is a headache?
a) Air-borne
b) Acute
c) Infectious
d) Chronic
Answer: b)
Ques. What are diseases caused by microbes called?
a) Non-infectious
b) Acute
c) Chronic
d) Infectious
Answer: d)
Also Check: Why Do we Fall Ill Class 9 Extra Questions Science Chapter 13
Ques. Which disease is caused by bacteria?
a) Influenza
b) Common cold
c) Anthrax
d) AIDS
Answer: c)
Ques. Which of these diseases is not infectious?
a) Cancer
b) Typhoid
c) Malaria
d) Cholera
Answer: a)
Ques. Antibiotics work against:
a) Elephantiasis
b) Virus
c) Bacteria
d) Parasites
Answer: c)
Ques. Which disease can an infected mother transmit to her baby through breastfeeding?
a) AIDS
b) Malaria
c) Kala-azar
d) Elephantiasis
Answer: a)
Ques. Who first tried the method of immunization?
a) Edward Jenner
b) Robert Hooke
c) Louis Hook
d) Louis Pasteur
Answer: a)
Ques. Which protozoan causes kala-azar?
a) Leishmania
b) Ascaris
c) Trypanosoma
d) Plasmodium
Answer: a)
Ques. Identify the odd one out:
a) Diphtheria
b) Cancer
c) Tetanus
d) Whooping cough
Answer: b)
Also Check: Why Do we Fall ill Class 9 Notes Science Chapter 13
Ques. Which of these diseases are acute?
a) Tuberculosis and Cancer
b) Cancer and Common cold
c) Common cold and Viral fever
d) Tuberculosis and Viral fever
Answer: c)
Ques. Which disease is transmitted by sexual contact?
a) Malaria
b) Syphilis
c) Kala-azar
d) Elephantiasis
Answer: b)
Ques. The AIDS virus cannot be transmitted by:
a) Sexual contact
b) Blood transfusion
c) Breastfeeding
d) Hugs and handshakes
Answer: d)
Ques. Which disease affects the human brain?
a) Malaria
b) Dengue fever
c) Jaundice
d) Japanese encephalitis
Answer: d)
Ques. Larynx is called:
a) Voice box
b) Respiratory organ
c) Music box
d) None of these
Answer: a)
Ques. Which is a congenital disease?
a) Deficiency disease
b) Present from birth
c) Spread from person to person
d) Occurs during a lifetime
Answer: b)
Ques. Which is not a viral disease?
a) Dengue
b) AIDS
c) Typhoid
d) Influenza
Answer: c)
Which is not a bacterial disease?
a) Cholera
b) Tuberculosis
c) Anthrax
d) Influenza
Answer: d)
Also Check: NCERT Solutions for Class 9 Science Chapter 13 Why do we fall ill
Ques. Which are examples of communicable diseases?
a) Diabetes
b) Arthritis
c) Cancer
d) Tuberculosis
Answer: d)
Ques. Sleeping sickness is caused by which protozoan?
a) Trypanosoma
b) Euglena
c) Plasmodium
d) Amoeba
Answer: a)
Ques. Which disease is not caused by bacteria?
a) Typhoid
b) Anthrax
c) Tuberculosis
d) Malaria
Answer: d)
Ques. Which has a long-term effect on health?
a) Common cold
b) Chickenpox
c) Chewing tobacco
d) Stress
Answer: c)
Ques. Which microorganism causes acne?
a) H1N1 virus
b) Trypanosoma
c) Leishmania
d) Staphylococcus
Answer: d)
Ques. What type of disease is caused by microbes?
a) Infectious
b) Non-infectious
c) Acute
d) Chronic
Answer: a)
Ques. Which disease is caused by a worm?
a) Measles
b) Poliomyelitis
c) Tuberculosis
d) Elephantiasis
Answer: d)
Ques. Which is not important for individual health?
a) Living in a clean place
b) Good economic condition
c) Social equality and harmony
d) Living in a large, well-furnished house
Answer: d)
Ques. After entering the human body, where does the malarial parasite go?
a) Liver, then RBCs
b) Stomach, then RBCs
c) Liver, then WBCs
d) Stomach, then salivary glands
Answer: a)
Ques. Why should we not allow mosquitoes to breed around us?
a) They multiply fast and cause pollution
b) They are vectors for many diseases
c) They bite and cause skin diseases
d) They are not important insects
Answer: b)
Ques. What is the literal meaning of disease?
a) Being happy
b) Being unaware
c) Being uncomfortable
d) Being uncomplicated
Answer: c)
Also Check: NCERT Exemplar Solutions for Class 9 Science Chapter 13 Why Do We Fall ill
Ques. Which bacteria cause peptic ulcers?
a) Helicobacter chlolecystus
b) Helicobacter salomonis
c) Helicobacter pylori
d) Helicobacter hepaticus
Answer: c)
Ques. What are the main symptoms of HIV-AIDS due to?
a) HIV alone causes all infections
b) HIV releases a poison in the body
c) HIV damages the immune system
d) HIV attacks the nervous system
Answer: c)
Ques. How long do acute diseases last?
a) Long period
b) Few hours
c) Short period
d) Life long
Answer: c)
Ques. Which is a chronic disease?
a) Cold
b) Diabetes
c) Influenza
d) Typhoid
Answer: b)
Ques. TAB-vaccine is used for immunity against typhoid. What does TAB stand for?
a) Typhoid-Paratyphoid A and B Vaccine
b) Typhoid-Partialtyphoid A and B Vaccine
c) Typhoid-Peroxytyphoid A and B Vaccine
d) Typhoid-Pertyphoid A and B Vaccine
Answer: a)
