CBSE Class 9 Science Why Do We Fall ill Worksheet Set 02

Download Class 9 Science Worksheets for Chapter 13 Why Do We Fall Ill

Review targeted practice sets for Class 9 Science Chapter 13 Why Do We Fall Ill. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.

Access Chapter 13 Why Do We Fall Ill Questions and Exercises

Navigate directly to the printable exercises for Chapter 13 Why Do We Fall Ill using the digital viewer below. Each practice set allows students to isolate specific topics for thorough review and uninterrupted practice alongside standard textbooks.

Question. Health is.
(A) Complete physical well being
(B) mental well being
(C) social well being
(D) all of the above
Answer : D

Question. Dislocation is a disease caused by
(A) Biological agent
(B) mechanical agent
(C) physical agent
(D) chemical agent
Answer : C

Question. Pathogens are destroyed by
(A) kidneys
(B) liver
(C) tonsils
(D) lymphatic tissues
Answer : D

Question. Antibodies are.
(A) lipids
(B) genes
(C) proteins
(D) carbohydrates
Answer : C

Question. Droplet infection is a mode of.
(A) direct transmission
(B) indirect transmission
(C) pathogen spread through mosquitoes
(D) tomite transmission
Answer : A

Question. A carrier is a human being that
(A) functions as a reservoir of infection
(B) possesses pathogen but is not harmed
(C) contains antibodies sufficient enough to balance the antigen
(D) all of the above
Answer : D

Question. The antigen present in pathogen is
(A) a specific protein involved in metabolism
(B) polysaccharide synthesized by it in the host
(C) a specific protein or polysaccharide present on its coat
(D) any of the two, A, or B.
Answer : C

Question. Specific defence mechanism against disease comprises
(A) physical barrier
(B) lysozme
(C) phagocytes
(D) immune system
Answer : D

Question. World Health Day Is On.
(A) 1ST May
(B) 7TH April
(C) 30th June
(D) 5th December
Answer : B

Question. A noninfectious unnatural and unusual reaction to a substance or condition is
(A) immunity
(B) allergy
(C) infection
(D) toxin
Answer : B

Question. AIDS day.
(A) May 1
(B) December 20
(C) June 1
(D) December 1
Answer : D

Question. Which are intimately related.
(A) Diseases and health
(B) Body and health
(C) Body and mind
(D) Body and spiritual health
Answer : D

Question. Which of the following statements is correct ?
(A) Degenerative diseases are non communicable
(B) Allergy is caused by droplet infection
(C) Cholera is a viral disease
(D) AIDS can be prevented by vaccination.
Answer : A

Question. Remain healthy means
(A) free of infection by pathogen
(B) tension free mental status
(C) Living in a pollution free environment
(D) All of the above
Answer : D

Question. Diseases occurring due to infected articles of a patient are called
(A) Air borne
(B) Water borne
(C) Fomite borne
(D) Food bome
Answer : C

Question. Pulse polio programme is organised in our country for.
(A) curing polio
(B) eradicating polio
(C) spreading polio
(D) non of the above
Answer : B

 
Very Short Answer
 
Question. Who made the discovery those bacterium helicobacter pylori responsible for peptic ulcers? 
Answer : Robin Warrren and Barry Marshall are the two scientist discovered a bacterium helicobacter pylori was responsible for peptic ulcers.
 
Question. What do you mean by communicable diseases? 
Answer : Communicable diseases are those that spread by an infectious agent, such as bacteria, viruses, fungi or parasites.
 
Question. What is vaccination? 
Answer : Vaccination is the administration of a vaccine to help the immune system develop protection from a disease.
 
Question. Define antibiotics? 
Answer : Antibiotics are the chemicals that block biochemical pathways important for bacteria. They are used for diseases caused by bacteria.
 
Question. What are pathogens?
Answer : The disease causing microbes are known as pathogens.

 

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Chapter 13 Why Do We Fall Ill Practice Sheet and Solutions for Class 9 Science

CBSE Practice Material: Class 9 Science Chapter 13 Why Do We Fall Ill

Explore reliable practice questions for Chapter 13 Why Do We Fall Ill tailored for Class 9 Science learners. Use these structured worksheets to evaluate preparedness and strengthen problem-solving skills.

NCERT-Aligned Questions and Solutions

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FAQs

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Are these Science Class 9 worksheets based on the 2026-27 competency-based pattern?

Yes, our CBSE Class 9 Science Why Do We Fall ill Worksheet Set 02 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 9.

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Yes, we have provided detailed solutions for CBSE Class 9 Science Why Do We Fall ill Worksheet Set 02 to help Class 9 and follow the official CBSE marking scheme.

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Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 9 students get more marks in CBSE exams.

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