NCERT Solutions for Class 9 Science Chapter 13 contains all intext and end exercise questions answers which will be very useful and helpful for you. NCERT Solutions for Class 9 Science Chapter 13 will help the students of class 9 to understand concepts.
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NCERT Solutions for Class 9 Science Chapter 13
NCERT Solutions for Class
9 Science Chapter 13 covers the complete syllabus. NCERT
Solutions for Class 9 Science Chapter 13 will help you to solve homework and home
assignments in an easy way. This is very useful for the students who are
studying NCERT Science books.
NCERT Solutions for Class 9 Science Chapter 13 Overview
1. Health and its Failure
2. The significance of health
3. Disease and its Causes
4. Personal and community issues
5. Infectious Disease
6. Acute and chronic diseases
7. Causes of diseases
8. Types of disease
9. Non- infectious disease
10. Disease-causing agents
11. Means or modes of spread
infectious disease
12. Organs and the tissue-specific manifestation
13. Principle of treatment and
prevention
14. Microbial, viral, bacterial
diseases
15. Protozoan disease
Students of CBSE affiliated schools,
RBSE, and other state boards of Rajasthan, Uttar Pradesh, M.P., Gujrat, and all
other states can download Solutions of Chapter 13 Why Do We Fall Ill of NCERT Science for
Class 9 in English medium and Hindi medium in PDF format for free.
Chapter
13 Why Do We Fall Ill
NCERT Solutions for Class 9 Science Chapter 13 Questions- Answers
Intext Questions
NCERT Solutions for Class 9 Science Chapter 13 Page No. 178
Q.1 State any two conditions essential for good health.
Ans.Two conditions essential for good health are:
1. Complete physical fitness free from any diseases.
2. Perfect mental and social wellbeing.
Q.2 State any two conditions essential for being free from any type of disease.
Ans. Two conditions essential for being free from any type of the disease are:
(i) Living in a hygienic environment.
(ii) Getting vaccination against common infectious diseases.
Q.3 Are the answers to the above questions the same or different? Why?
Ans. The answers are different because Health is a perfect state of physical, mental, and social wellbeing of a person while the disease is a state of the discomfort of the body or its parts.
NCERT Solutions for Class 9 Science Chapter 13 page no. 180
Q.1 List any three reasons why you would think that you are sick and ought to see a doctor. If only these symptoms were present, would you still go to the doctor? Why or Why not?
Ans. The three reasons for feeling sick and visiting a doctor are:
(i) having diarrhoea (loose-motions),
(ii) having headache, shivering, and fever,
(iii) having a wound with pus.
Yes, we would go to the doctor if only one of the above three symptoms were present, we still would have to consult a doctor. It is so because all three symptoms made us uncomfortable and cause further damage to the body sometimes due to the attack of some disease.
Q.2 In which of the following cases do you think the long-term effects on your health are likely to be most unpleasant?
(a) If you get jaundice, (b) If you get lice, (c) If you get acne, why?
Ans.In the case of jaundice. Because lice can be treated/removed easily. Similarly, acne is a minor problem but jaundice may become a chronic disease and requires a long time incomplete recovery.
NCERT Solutions for Class 9 Science Chapter 13 page no. 187
Q.1 Why are we normally advised to take bland and nourishing food when we are sick?
Ans. We are advised to take bland and nourishing food when we are sick because it helps in strengthening the immune system and provides nourishment to the body for the recovery of wear and tear and fighting infection. This kind of food provides us with nutrients to our body that will further provide energy and make a new cell.
Q.2 What are the different means by which infectious diseases are spread?
Ans. The different means by which infectious disease spread air, water & food are direct contact, sexual contact, vectors
i. The air carries bacteria, viruses, and other pathogens
ii.Contaminated food and water contain disease-causing pathogens.
iii. Some kind of fungal infections and skin diseases spread through direct physical contact
iv. AIDS, syphilis, etc. are caused by sexual contact.
v. Vectors like mosquitos, flies spread diseases.
Q.What precautions would you take in your school to reduce the incidence of infectious diseases?
Ans. To reduce the incidence of infectious disease-
i. Use a handkerchief while coughing and sneezing.
ii. Proper disposal of garbage
iii. Wash your hand before eating.
iv. Get vaccination
v. Keep surroundings clean
vi. No stagnant water should be kept near school
vii. Rooms must be ventilated.
Q.9 What is immunization?
Ans. Immunization is the process by which the body attains immunity against diseases and this is done by vaccination.
Q.10 What are the immunization programs available at the nearest health center in your locality? Which of these diseases are the major health problems in your area?
Ans.Following immunization programmes are available at the nearest health centre in our locality, -
(i) For preventing tuberculosis
(ii) For preventing polio / typhoid / hepatitis – B
(iii) For preventing tetanus, diptheria, and whooping cough.
Measles in our area is the major health problems
NCERT Solutions for Class 9 Science Chapter13 Exercise
Q.1 How many times did you fall ill in the last one year? What were the illnesses?
(a) Think of one change you could make in your habits in order to avoid any of/ most of the above illnesses.
(b) Think of any change you would wish for in your surroundings in order to avoid any of / most of the above illnesses.
Ans. I felt ill two or three times last year, the disease was cholera.
(a)I take clean or pre-boiled water and good quality food. Food kept in open should be avoided.
(b)Our surroundings should be made cleaner.
Q.2 A doctor/nurse/health-worker is exposed to more sick people in the community. Find out how she/he avoids getting sick herself/ himself.
Ans. A doctor/nurse/heath-worker is exposed to more sick people in the community. He/she avoid getting sick by:
They can keep themselves healthy and avoid sickness by following steps:
(i) By using a mask to cover nose and mouth.
(ii) Taking appropriate vaccination.
(iii) Taking balanced and healthy diet, regular exercise.
(iv) Washing hands after treating the patients.
Q.3 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 t bring down the incidence of these diseases.
Ans. The three most common diseases are:
(i) Malaria
(ii) Tuberculosis
(iii) Common cold and cough
Three steps that should be taken by local authorities to bring down the incidence of these diseases are:
(i) Use of insecticides to kill adult mosquitoes and removal of breeding places of mosquitoes like stagnant water.
(ii) Providing proper sanitation facilities.
(iii) Providing nourished food and vitamins C
Q.4 A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out:
(a) That the baby is sick
(b) What is the sickness?
Ans. (a) The following symptoms would help us to find that the baby is sick-
(i) The baby is crying.
(ii) Fever or high temperature
(iii) To find the sickness he must be taken to the doctor. The doctor conducts some tests and from the symptoms, he can find out the sickness.
(iv) He/she vomits and has diarrhea.
Q.5 Under which of the following conditions is a person most likely to fall sick:
(a) When she is recovering from malaria
(b)When she has recovered from malaria and is taking care of someone suffering from chickenpox
(c) When she is on a four-day fast after recovering from malaria and taking care of someone suffering from chickenpox. Why?
Ans. (C) The reason is that after suffering from malaria the person becomes anaemic and weak. The immune system also becomes weak and she is on four day fast which also makes her body weak due to improper intake of food. So, her chances to get chickenpox. Above all, she is taking care of someone who is suffering from a contagious disease i.e. chickenpox. She has more chance of getting an infection due to the above-given reasons.
Q.6 Under which of the following conditions are you most likely to fall sick?
(a) When you are taking examinations.
(b) When you have travelled by bus and train for two days.
(c) When your friend is suffering from measles. Why?
Ans. (c) It is so because measles is an infectious disease and this can be spread through physical contact.
These NCERT solutions and study material will help you good marks for your CBSE Board and Other state board exams.
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Important points of NCERT Solutions for Class 9 Science Chapter 13
1. Health is a state of physical, mental, and social wellbeing.
2. The health of an individual is dependent on his/her physical surroundings and his/her economic status.
3. Diseases are classified as acute and chronic, depending on duration.
4. Disease is a disorder in a human, animal, or other living beings by infection, poor diet, or other faults in the functioning of life processes.
5. Diseases may be due to infectious or non-infectious causes.
6. Infectious agents belong to different categories of organisms and may be unicellular and microscopic or multicellular.
7. Public and community hygiene is the most important for individual health.
8. The category to which a disease-causing organism belongs decides the type of treatment.
9. Infectious diseases can be prevented by immunization.
10. Infectious agents are spread through the air, water, vectors, and physical contact.
11. Disease causing organisms are also called pathogens.
12. Prevention of disease is more desirable than its successful treatment.
13. Infectious diseases can be prevented by public health hygiene measures that reduce exposure to infectious agents.
Important Facts of NCERT solutions for Class 9 Science Chapter 13
1. Painful bleeding regions or areas in the stomach are called peptic ulcers.
2. stress and lifestyle of a person may cause gastric acidity.
3. Area of peptic ulcers of the affected person contains small bacteria named Helicobacter pylori.
4. Antibiotic amoxicillin is effective in killing the bacteria Helicobacter pylori.
5. Antibiotics are chemicals produced by bacteria and fungi.
6. Sir Alexander Fleming discovered the first antibiotic – Penicillin.
7. the credit of the discovery of the method or technique of immunization goes to Edward Jenner.
8. AIDS is not a disease, it is considered as ‘Syndrome’.
9. National AIDS control organisation (NACO) was established in1992.
10. AIDS can be diagnosed by ELISA test.
11. National AIDS control programme in India was introduced in 1987.
12. National TB programme was started in 1962.
13. Malarial day is on August 20th.
14. World TB Day is on 24th March.
Important Terms related to NCERT solutions for Class 9 Science Chapter 13
1. Vector- Organisms that carry disease-causing pathogens.
2. Anaemia – The state or condition of deficiency of hemoglobin in the blood.
3. DDT- Dichloro diphenyl Trichloroethane.
4. Antibiotic- The chemical substance produced by micro-organisms like bacteria and fungi.
5. Immunity – Resistance power or strength of the body to fight against diseases.
6. Epidemic - disease which spread in a wide or large area.
7. Pandemic – a disease which spread all over the world like – Corona or Covid
