Please refer to Chapter 13 Why Do We Fall ill MCQ Class 9 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 9 Science. Students should refer to MCQ Questions for Class 9 Science with Answers to score more marks in Grade 9 Science exams. Students should read the chapter Why Do We Fall ill and then attempt the following objective questions.

MCQ Questions Class 9 Science Chapter 13 Why Do We Fall ill

The Why Do We Fall ill MCQ Class 9 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. HIV virus mainly attacks
a. nervous system
b. respiratory system
c. lymph nodes
d. multiple organs.

Question. Microbes that enter the body through mouth most likely affects
a. liver
b. alimentary canal
c. lungs
d. both (a) and (b).

Question. Acne is caused by
a. Leishmania
b. Propionibacterium
c. Trypanosoma
d. Plasmodium.

Question. Penicillin blocks
a. protein biosynthesis in bacteria
b. DNA replication in bacteria
c. cell wall biosynthesis in bacteria
d. protein synthesis in viruses.

Question. Which of the following can be the sign of a disease?
a. Change in skin colour
b. Nausea
c. Body ache
d. Fever

Question. The organism which causes Kala-azar is
a. Trypanosoma
b. Plasmodium
c. Leishmania
d. Entamoeba.

Question. Which organ is affected if a person is suffering from Japanese encephalitis?
a. Liver
b. Lungs
c. Brain
d. Heart

Question. Which of the following is a chronic disease?
a. Malaria
b. Asthma
c. Influenza
d. Cholera

Question. Which one of the following is not a viral disease?
a. AIDS.
b. SARS
c. Tuberculosis
d. Dengue

Question. Vector for dengue disease is
a. female Anopheles mosquito
b. female Aedes mosquito
c. female Culex mosquito
d. none of these.

Question. SARS disease causes damage to our
a. brain
b. liver
c. intestine
d. lungs.

Question. Pathogens which cause tuberculosis are transmitted through
a. contaminated Water
b. sexual contact
c. air
d. contaminated food.

Question. If liver is targeted by microbes for infection, there will be
a. jaundice
b. cough and breathlessnes
c. fits and unconsciousness
d. none of these.

Question. Which of the following causes sleeping sickness?
a. Wuchereria
b. Ascaris
c. Trypanosoma
d. Leishmania

Question. Which of the following are true regarding acute disease?
i. Has long term effect on the general health of the person
ii. Has short term effect on the general health of the person
iii. C1holera and typhoid are acute diseases
iv. Diabetes and Arthritis are acute diseases
a. i. and iv.
b. ii. and iv.
c. i. and iii.
d. ii. and iii.

Question. The pathogen and the target organ of malaria are
a. female Anopheles mosquito ,blood
b. Plamodium, blood
c. Plasmodium, liver
d. female Anopheles mosquito, liver.

Question. AIDS cannot be transmitted by
a. handshake
b. sexual contact
c. breast feeding
d. blood transfusion.

Question. Hepatitis is caused by
a. bacteria
b. fungi
c. virus
d. protozoa.

Question. Which of the following disease is spread by droplet infection?
a. Hepatitis
b. AIDS
c. Common cold
d. Kala-azar

Question. It is difficult to make antiviral medicines because
a. viruses are not alive outside the host organism
b. viruses have very few biochemical pathway of their own
c. viruses lack membrane
d. all of these.

Question. Which of the following statement is not correct regarding vaccination?
a. It specifically remembers the dead microbe
b. It produces antibodies when the pathogen attacks the body
c. It blocks the food supply of the pathogen
d. It provides immunity against the pathogen

Question. A sexually transmitted disease caused by bacteria is
a. Herpes
b. Syphilis
c. AIDS
d. none of these.

Question. Which of the following statement are correct regarding antibiotics?
i. These are chemicals produced by microbes
ii. These are substances produced by our body in response to antigens
iii. They block the biochemical pathway of the microbes
iv. They play significant role in body’s immune system
a. ii. and iv.
b. i. and iii.
c. ii. and iii.
d. i. and iv.

Question. Choose the correct options regarding the symptom of a disease.
i. It is felt by the patient
ii. It is what physicians look for
iii. It indicates that there is something wrong in the body
iv. It gives more indication of a particular disease
a. i. and iv.
b. ii. and iii.
c. i. and iii.
d. ii. and iv.

Question. Which of the following is a non-communicable disease?
a. Cancer
b. Common cold
c. Tuberculosis
d. Covid-19

Question. Which of the following disease is caused by a virus?
a. Tuberculosis
b. Cholera
c. SARS
d. Typhoid

Question. The severity of disease manifestation depends upon the
a. organ infected by the microbe
b. path taken by microbe to enter the body
c. number of microbes present in the body
d. all of these.

Question. Prevention is better than cure because
a. body functions of the infected person are damaged
b. the infected person can serve as a reservoir of infection
c. the infected person remain bedridden for some time
d. all of these.

Question. Female Anopheles mosquito is a carrier of a pathogen which causes
a. malaria
b. dengue
c. Japanese encephalitis
d. filariasis.

Question. Which of the following does not indicate inflammation?
a. Redness and swelling
b. Pain
c. Fever
d. Cough

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