Class 9 is the first stepping stone for a student in the competitive world. With the introduction of the CBSE Board Exam for class 10 a few years back, this has become an important gateway for a student. Based on the results of class 9th a student selects his future stream of Science, Commerce or Arts suiting his interest.
Takshila Learning is providing NCERT Solutions for Class 9 Biology as per the latest syllabus by CBSE. Class 9 is the building block for the CBSE Class 10 Board Exams, not only for your exams but also for your higher studies and career. Biology is the most essential subject and the knowledge in this field opens up wider career opportunities for the students.
Below you can find the NCERT solution for Class 9th Biology. You can get a Solution for the all-important question of Class 9 Science, Chapter 13: Why do we fall ill
- State any two conditions essential for good health.
- Good economic condition and earnings
- Social environment.
- State any two conditions essential for being free of disease.
- Living in a healthy and hygienic environment.
- Get vaccination against infectious disease whenever required.
- Are the answers to the above questions necessarily the same or different? Why?
The answers to the above questions vary because the person may be free from illness but may not be mentally, socially and financially well off.
In-Text Questions 13.2.5
- List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
(a). Headache, fever(B). Muscle aches(C). DysenteryUsually, we do not go to see a doctor if any of the symptoms are seen because it does not affect normal health ability to function. But, if these symptoms are observed for a long time, then we should consult a doctor for proper treatment.
- In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
- if you get jaundice
- if you get lice
- if you get acne. Why?
Jaundice causes long term effects on our health. This chronic disease lasts for a long time. Jaundice develops slowly and does not spread rapidly.
In-Text Questions 13.3.5
- Why are we normally advised to take bland and nourishing food when we are sick?
When we fall ill, the normal functioning of the body goes awry and does not function normally. As a result, improper ability of digestion, we lose appetite and the absorption of food is slow. Therefore, we are advised to take Bland and nutritious food during the disease as it is easily digested and contains sufficient amount of nutrients, vitamins and minerals to produce energy.
- What are the different means by which infectious diseases are spread?
Infectious diseases are usually spread through the following methods – water, air, vectors such as mosquitoes, sexual contact, physical contact with the affected, or by using the affected person’s clothes, bedding, utensils, etc.
- What precautions can you take in your school to reduce the incidence of infectious diseases?
To reduce the incidence of infectious diseases, we can take some precautions -(a). Trying to stay away from students who are infected.(B). Covering the mouth and nose while coughing and sneezing.(C). Keep the school environment clean so that there are no multiplying vectors.(D). Consuming safe aqua guard water.
- What is immunization?
The method to boost our immune system with the help of vaccines that help the body to fight against infectious diseases is called immunization.
- 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?
Immunization programs available at the nearest health centers are measles, mumps and rubella (MMR), polio vaccine, jaundice, diphtheria, pertussis and tetanus (DPT), typhoid, hepatitis B.Typhoid and jaundice from above cause major health problems.
- 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 one change you would wish for in your surroundings in order to avoid any of/most of the above illnesses.
I fell ill twice in the last year. I was suffering from diarrhea first and then dengue fever.(A) Change in my habits after suffering from these diseases(i) I will always drink pure and clean water and wash my hands before eating any food item.(ii) I will live in a clean environment where disease-causing vectors will not grow.Examples of multiple vectors are mosquitoes.(b) A change I wish for the people around me so that a healthy society can provide pure drinking water for the people. Consumption of impure water is the root cause of many infectious diseases.
- A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself.
Some important precautions that a doctor / nurse / health worker needs to take while treating sick people as compared to others in the community -(a). Do not forget to wear a mask when in contact with a diseased person.(B). Drinking pure water.(C). Cleanliness and personal hygiene are not neglected.(D). Properly covering oneself when visiting an infected area(I). Eating nutritious food and maintaining a healthy diet.
- Conduct a survey in your neighborhood to find out what the three most common diseases are. Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases.
The following three are the most common diseases in any neighborhood:Cold and cough, loose motion and malaria.Some preventive measures can be taken:(a). Drinking fresh, unpaved and clear water.(B). By maintaining a state of hygiene-related hygiene.(C). By educating people about various preventive measures with the help of posters, and pamphlets.
Exercise Questions 188
- 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?
(a). This can be detected by observing the child’s behavioral changes such as:• Improper food intake• cry continuously• Repeated mood changes(B). The disease can be determined with the help of the symptoms or signs shown by the child. Its symptoms may be loose motion, vomiting, stiffness in the body and fever.
- 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 chicken-pox.
(c) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why?
A situation in which a person is most likely to fall ill when he is on a four-day fast as soon as he has recovered from malaria and is caring for someone suffering from chicken-pox. Because she has not fully recovered from malaria and is fasting when her immune system is still weak. At this stage his body will not be able to fight the infection and even if he is caring for someone else suffering from chicken pox, he may still be infected with the chickenpox virus and fall ill again.
- 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?
A person is most likely to fall ill when his friend suffers from measles. It is a highly contagious disease and can be easily transferred through air and respiration. It is better to always stay away from your friend who is affected by measles and even you will get infected with the disease.
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