Class 9 Exam > Class 9 Notes > Why Do We Fall Ill? - NCERT Extra Questions & Answers, Class 9 Science
Why Do We Fall Ill? - NCERT Extra Questions & Answers, Class 9 Science PDF Download
1. Define Health.
Ans. According to WHO (World Health Organisation) , It is the state of complete physical, mental and social well being.
2. What is Disease ?
Ans. Anything which interferes with the normal functioning of the body and impairs the health.
3. Differentiate Congenital Diseases from Acquired ones.
Ans. Congenital :
a. These occur since from birth.
b. inherited from the parents to the offspring.
Acquired :
a. It occurs during the lifetime of the person and not from the birth.
b. It does not get inherited.It occurs due to pathogens or due to deficiency of nutrients, hormonal imbalance or due to degeneration of the tissues.
4. What is Incubation Period?
Ans. It is the period between the infection and the appearance of the first symptom.
5. Name the diseases which are caused by :
a. Bacteria : TB, Typhoid, Anthrax and Tetanus
b. Viruses : Common Cold, AIDS, Dengue fever and Mumps.
c. Fungi : Ring worm, Skin infections and Athlete's foot
d. Protozoa : Malaria, Kala Azar, Sleeping Sickness and Amoebiais
6. Important points :
a. Malaria is spread by the mosquito Anopheles
b. Mosquito Culex spread Filaria.
c. AIDS is caused by the Retrovirus HIV.
d. A dengue is the Virul disease caused by a day time biting of the mosquito called Aedes
e. TB is caused by a bacterium Mycobacterium Tuberculosis.
f. Typhoid is caused by Salmonella Typhi.
g. Leishmania Donovani is the protozoan which causes Kala azar (black fever)
h. Helicobacter pylori is a small curved shaped bacteria which is responsible for the peptic ulcers.
7. Which was the first Anti biotic?
Ans. Penicillin which was invented by Alaxander Flamming in 1928.
8. Name the Organs which are targeted by specific diseases :
a. Hepatitis : Liver
b. Fungal Diseases : Skin
c. Pneumonia : Lungs
d. TB : lungs
e. Diarrhoea : Intestines.
9. Which is the most common type of Plague?
Ans. Bubonic Plague.
10. Who discovered Vaccine for the first time and which one?
Ans. Edward Jenner invented the vaccine for the first time and it was of smallpox.
FAQs on Why Do We Fall Ill? - NCERT Extra Questions & Answers, Class 9 Science
| 1. What are some common causes of illness? |  |
Ans. Common causes of illness include poor hygiene, inadequate nutrition, exposure to toxins or pollutants, genetic predisposition, and infections caused by bacteria, viruses, fungi, and parasites.
| 2. Can mental health issues lead to physical illness? | |
Ans. Yes, mental health issues like stress, anxiety, and depression can weaken the immune system, making a person more susceptible to infections and illnesses. They can also lead to lifestyle changes like poor diet and lack of exercise, which can contribute to physical health problems.
| 3. How does vaccination help prevent illness? | |
Ans. Vaccination helps prevent illness by triggering the body's immune system to produce antibodies that can recognize and fight specific diseases. This makes a person immune to the disease without having to go through the actual illness, which can be dangerous and sometimes even deadly.
| 4. What are some common symptoms of illness? | |
Ans. Common symptoms of illness include fever, cough, sore throat, runny or stuffy nose, headache, body aches, fatigue, and gastrointestinal problems like nausea, vomiting, and diarrhea.
| 5. What can we do to prevent illness? | |
Ans. To prevent illness, we can practice good hygiene like washing hands regularly, covering our mouth and nose when coughing or sneezing, avoiding close contact with sick people, getting enough sleep, eating a healthy diet, staying hydrated, and getting vaccinated. It's also important to seek medical attention promptly if we experience symptoms of illness.
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