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Published on: 05/12/2018
CBSE Class 9 is a crucial grade in your secondary school education. So learning with effective preparation is a must. Our study materials for CBSE Class 9 follow the latest CBSE syllabus and are prepared by subject experts who have much experience in the academic industry. In this question paper, the questions are cover from the 9th Science chapter Why Do We Fall Ill. Questions are prepared as per NCERT guidelines by the help of expert teachers.
By referring to our solutions, students get a clear understanding of each concept in detail. Students who have referred to our solutions have seen a significant increase in overall marks and ease in understanding the subjects. Our study materials are not only used by students but also by educational institutes in India.
In this post, we are providing you with the most important questions of Science exam from the chapter Why Do We Fall Ill. You should know answers to these questions in all likelihood to score good marks in Class 9 Science exam.
The latest sample papers have been designed as per the latest blueprints, syllabus and examination trends. Sample papers should be practiced in examination condition at home or school and also show it to your teachers for checking or compare with the answers provided.
Download CBSE Class 9th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 9th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test

1.
Teacher told students that the attainment of a Healthy environment is very important for a healthy person .It is the duty and responsibility of every individual in soceity to keep the environment clean and prevent pollution .It is the responsibility of the school staff they are paid to do it.
Answer the following questions based on the above information:
(a) How can we contribute towards maintaining a neat and clean environment in school?
(b) Which values teacher displayed by talking cleanliness of school?
2.
Kusum and Kuldeep were discussing that in our village a large number of the child either die after a few days of birth or at very early age of their childhood.What should we do to tackle this problem? Kusum said that we should gather the required knowledge from the maternity nursing home or trained maternity nurse.Then with the help of our friends and panchayats,we should educate the illiterate pregnant expected mothers.
Answer the following questions based on the above information:
(a) What information they gathered to prevent infant/early childhood mortality?
(b) Which values are displayed by kusum and kuldeep?
3.
State and explain in brief the four major factors, which cause disease.
4.
A group of 6 students was discussing some subject matter all of a sudden a student started sneezing and another one started coughing . Rajesh asked both of them to put a handkerchief on their mouth while sneezing or coughing.
Answer the following questions based on the above information:
(a) Why did Rajesh ask to put handkerchief while sneezing or coughing?
(b) Which values are displayed by Rajesh?
5.
Why are we normally advised to take bland and nourishing food when we are sick?
6.
Why making anti-viral medicines is harder than making anti-bacterial medicines?
7.
List four common diseases caused by viruses.
8.
Conduct a survey in your neighbourhood to find out what the three most common disease are. Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases.
9.
List the cause of disease.
10.
How does personal health relate to community health?
11.
Rohit told Mohit that malaria is spreading these days.you should be careful.Mohit said that he read in the book that malaria is transmitted by the bite of female Anopheles mosquitoes These mosquitoes breed in stagnant water such as ponds,ditches,water coolers,water storage tanks,etc.Rohit and Mohit decided to take help from friends and also take help from concerned Municipal department to do the needful and educate the community.
Answer the following questions based on the above information:
(a) Which preventive measures do you suggest for the prevention of such diseases caused by mosquitoes?
(b) Which values are displayed by Rohit and Mohit?
12.
What are immediate cause and contributory cause of disease?
13.
Who were awarded nobel prize for discovery of peptic ulcer causing bacterium Helicobacter pylori?
Marshall
Leuwenhock
Warren
Both (a) and (b)
14.
Diseases where microbes are the immediate causes are called
non-infectiuos
acute
chronic
infectious
15.
Which one of the following disease an infected mother can transmit through breast feeding to her body?
Malaria
AIDS
Kala-azar
Elephantasis
16.
Antibiotics work against
bacteria
virus
elephantiasis
dengue
17.
Which one of the following is dangerous for individual health?
Garbage thrown is streets
Open drainage
Stagnant water around our living
All of these
18.
Antibiotic penicillin act against bacteria by
Killing the bacteria
neutralizing the bacteria
blocking biochemical pathways important for bacteria
None of the above
19.
The protozoa organism responsible for sickness is
Ameba
Entamoeba
Plasmodium
Trypanosoma
20.
Antibiotics commonly ...... biochemical pathways important for bacteria.
21.
Most of the common skin diseases are caused by different kinds of ..............
22.
Common cold is an .......... disease because it lats only for a few days.
23.
Diseases are classified as ............. or ............., depending on their ..........
24.
In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
(i) If you get jaundice,
(ii) If you get lice,
(iii) If you get acne.
Why?
1.
1. It is our responsibility too since cleanliness is our concern also.
2. We can contribute by not throwing paper and dirt here and there,keeping the things in orderly manner,etc
3. Keeping classrooms clean.
4. Not damaging desks or other school property
5. keeping toilets clean.
6. Helping younger students in keeping the school neat-clean.
7. Not littering and keeping playgrounds clean.
8. Helping in maintaining safe school transport.
(b) (1) Importance of keeping the environment clean
(2) To make student understand that they alos have responsibility to keep the school and safeguard its property.
2.
Prevention of Infection
"Infection of various kinds is the most important single cause of disease and death in this age period" This cannot be observed by an untrained midwife at the time delivery of in home.
The basic principles underlying preventive measures are:
1.Prevention of contact with infected individuals.
2.Maintenance of cleanliness.
3.Follow immunization procedures as given below:
| Age | Procedure |
| At birth | B.C.G |
| 3 months | Smallpox vaccination (primary) |
| 4 months | 1st dose: Triple antigen injection and oral polio vaccine |
| 5 months | 2nd dose |
| 6 months | 3rd dose |
| 11/2 years | Booster dose, triple antigen injection |
(b) (1) Community service
(2) Social responsibility.
3.
The factors which are important for maintaining good health and if not present will lead to diseases are:
(i) Availability of proper balance diet (food) in sufficient quantity and clean water.
(ii) Good environment or surroundings that includes physical environment, Public cleanliness is important.Stagnation of dirty water, presence of open drains, garbage, in the surrounding cause spread of diseases.
(iii) Good special environment is an important factor is maintaining good health.If people mistreat each other or some particular people, they are mentally ill, they cannot lead happy life.
(iv) Good economic condition or job is the major factor which causes disease.For example, to provide good and proper food, clean clothes and hygienic conditions, proper social relationship, good economic conditions are essential.
4.
1. While sneezing or coughing the little droplets are thrown out which are carried by air to persons sitting or standing nearby These infection carrying droplets are inhaled by the persons.Thus,air borne diseases such as common cold, influenza(Flu),small pox,tuberculosis,etc spread in the community.
2. All the diseases which come out of the nose or throat are being received in handkerchief which can be well washed by soap and anti-infectious substance.
(b) (1) Creating senstivity about spreading of air borne diseases .
2.Environmental protection.
5.
The functioning of the immune system, like any other system in our body, will not be good when we are sick.To provide sufficient nutrients, the patient should be provided easily digestible bland and nourishing food in proper quantities.This will help the patient in quick recovery and proper functioning of all the body systems.
6.
(i) Viruses lack any cell well of their own.They enter our cells and use our machinery for their life processes.
(ii) They do not have cytoplasm and cell organelles.To multiply they enter the cell of living organism.They use cellular resources of the host to reproduce.
(iii) As viruses lack cells, biochemical process are missing in viruses.Since these biochemical processes are targets of antibiotics, antibiotics do not work on viruses.
7.
(i) common cold
(ii) dengue fever
(iii) influenza
(iv) AIDS
8.
Three most common diseases are:-
(i) Tuberculosis
(ii) Typhoid
(iii) Jaundice
Steps to be taken to bring down the incidence of these diseases are:-
(i) Proper disposal of sewage.
(ii) Ensuring supply of safe drinking water.
(iii) Providing a clean environment and preventing mosquitoes from breeding.
9.
(i) Infection
(ii) poor health
(iii) Lack of proper and sufficient food
(iv) Lack of public services
(v) Genetic defects.
10.
Both community and personal health are important in making a good health.They are supplement with each other.We maintain personal health by keeping ourselves and our house clean and taking balanced diet.Further, to keep personal health, we need healthy environment to interact with it.Healthy environment concerning to a community is essential to maintain physical, mental, biological and social viability in favour of personal health.
11.
1. Filling of bitches with mud where mosquitoes breed
2. Water tanks should not be left open.Water in the coolers should be changed frequently.
3. Water surfaces are sprayed with kerosine oil,petroleum,paraffin,oil,etc.so that mosquitoes are killed in their larval or pupal stages.
4. By fumigating kill the adult mosquitoes ,effective in driving the mosquitoes out.
5. Spraying D.D.T ,b.H.C lindane and other effective insecticides to kill the mosquitoes (chemical control)
6. By the use of mosquito nets and use of mosquito repellents.
(b) Community service and social responsibility.
12.
(i) Immediate cause of disease is Infectious organisms like virus, bacteria, fungi, protozoan etc.For example, the cause of loose motions can be an infection with a virus, Here viruses is the immediate cause of disease.
(ii) Contributory cause of disease:
(a) poor health due to lack of good nourishment.
(b) poor economic condition due to which one does not get proper and sufficient food and lives in unhygienic conditions.
(c) genetic defects which cause some people more prone to disease than others.
(d) Lack of public services.
13.
(d)
Both (a) and (b)
14.
(d)
infectious
15.
(b)
AIDS
16.
(a)
bacteria
17.
(d)
All of these
18.
(c)
blocking biochemical pathways important for bacteria
19.
(d)
Trypanosoma
20.
( )
block
21.
( )
fungi
22.
( )
acute
23.
( )
acute, chronic, duration
24.
Jaundice is a disease that can cause long-term effects on our health. It is a chronic disease that lasts for a long period of time. Jaundice does not spread rapidly, but it develops slowly over a period of time.
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