Class 9 Exam > Class 9 Notes > Chemistry for Class 9 > Previous Year Questions - Why do we fall ill
Class 9 Science Previous Year Questions - Why do we fall ill
Short Answer Type Questions
Q.1. (i) Write the definition of health as given by WHO.
(ii) List two factors that affect health. [CBSE 2017]
Ans: (i) WHO stands for World Health Organisation. According to WHO, “Health refer; to state of complete physical, mental and social well-being.”
(ii) Factors affecting health are :
(а) Malnutrition
(b) Infection
(c) Emotional disturbance
Q.2. Name the two types of diseases one caused by some external agents and other due to some internal disorder of the body. Mention any two causative agents. [CBSE 2017]
Ans: Disease caused by :
(i) External agent - Malaria, Tuberculosis etc.
(ii) Internal disorder - High blood pressure, cancer, diabetes etc.
Causative agents :
(i) Malaria - Plasmodium virax.
(ii) Typhoid - Salmonella typhi.
Q.3. Why do female mosquitoes need highly nutritious food in the form of human blood? [CBSE 2016]
Ans: Female mosquitoes need highly nutritious food in the form of human blood to be able to lay mature eggs.
Q.4. What is meant by community? How our personal health is related to community issues? Explain in brief, [CBSE 2016]
Ans: Community is defined as a group of people who live in a certain locality and interact with one another having a common goal.
Personal health is the state of physical, mental and social well being of an individual. Community health is the maintenance, protection and improvement or overall well being of health of the whole community.
Health of a person depends on his personal habits as well as physical environment. Social equality and harmony in the community are also important to maintain individual’s health. So our social environment is an important factor in our individual health. Therefore our social environment is an important factor in our individual health. Similarly, the health of . the whole community depends on the personal habits of various individuals who constitute the community.
Q.5. Classify the following under fungus/protozoan viral/bacterial diseases:
Tuberculosis, malaria, skin infection, typhoid hepatitis. [CBSE 2015]
Ans:
Long Answer Type Questions
(i) Name the disease he is suffering from.
(ii) Name the pathogen that has attacked his body.
(iii) Mention any three modes of transmission of this disease. [CBSE 2017]
Ans: (i) He is suffering from AIDS or Acquired Immuno-Deficiency Syndrome.
(ii) The pathogen is a virus called HIV or Human-Immuno-deficiency virus.
(iii) This virus is transmitted through following ways :
(a) Sexual contact with an infected person carrying AIDS virus.
(b) Transfusion of blood infected with HIV.
(c) Use of unsterilized needles, blades or razors.
(d) Transplacental transmission i.e., AIDS infected mother to the foetus developing in her womb.
Q.2. Complete the table: [CBSE 2016]
Ans:
Q.3. Label the following picture (a) to (b) to show the common mode of disease transmission. [CBSE 2015]
Ans: (a) Direct contact
(b) By air
(c) Indirect contact
(d) By food
(e) Mosquito/insect
(f) Rabid animal
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FAQs on Class 9 Science Previous Year Questions - Why do we fall ill
| 1. What are the common symptoms of falling ill? |  |
Ans. Common symptoms of falling ill include fever, cough, sore throat, body aches, fatigue, vomiting, diarrhea, and difficulty in breathing.
| 2. How does our body defend against diseases? | |
Ans. Our body defends against diseases through the immune system. The immune system consists of specialized cells and proteins that recognize and destroy pathogens, such as bacteria and viruses. It also has the ability to remember and recognize these pathogens in case of future infections.
| 3. How can poor hygiene lead to illness? | |
Ans. Poor hygiene can lead to illness as it allows harmful microorganisms to enter our body. For example, not washing hands before eating can transfer bacteria and viruses from contaminated surfaces to our mouth, leading to diseases like food poisoning. Similarly, not maintaining cleanliness in living areas can create a breeding ground for disease-causing microorganisms.
| 4. How does a balanced diet help in preventing illnesses? | |
Ans. A balanced diet provides essential nutrients, vitamins, and minerals that strengthen our immune system and help in preventing illnesses. Nutrient deficiencies can weaken the immune system, making us more prone to infections. On the other hand, a well-balanced diet ensures that our body has the necessary resources to fight off diseases and maintain good health.
| 5. What are the different modes of transmission of diseases? | |
Ans. Diseases can be transmitted through various modes, including direct contact (such as touching an infected person), indirect contact (touching contaminated objects), respiratory droplets (when an infected person coughs or sneezes), waterborne transmission (ingesting contaminated water), and vector-borne transmission (through vectors like mosquitoes or ticks). It is important to take preventive measures to reduce the risk of transmission, such as practicing good hygiene and getting vaccinated.
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