Why do we fall ill Class 9 science chapter 13

Class 9 Science

Chapter 13 Why do we fall ill

Extra Questions

Q- 1 What is the meaning of being healthy?

Ans – Health is state of being well enough to function well physically, mentally and socially. Being physically well means a person with no major disease or being disease free. Being mentally well means a person who is fit mentally. Being Socially well means our social environment should be healthy.

Q- 2 What is a disease?

Ans – Disease means disturbed ease or being uncomfortable. Disease is a situation in which a person experiences some specific symptoms and causes for the discomfort.

Q- 3 What is meant by the symptoms of a disease?

Ans – When a person experiences some special situations for a particular cause which has happened in the body then these are the symptoms of a particular disease. For example – headache, loose motions, body pain, fever or watering eyes etc.

Q- 4 What are the vectors?

Ans – The animals carry the infecting agents from a sick person to another potential host. These animals are the intermediaries and are called vectors. The most common vectors are mosquitoes.

Q- 5 What is community health?

Ans – This health includes personal health with surrounding environmental health in which cleanliness of environment and social harmony also come.

Q- 6 What are the source of infection?

Ans – A source of infection can be an infected person, a mosquito, a virus and used objects of an infected person.

Q- 7 How can dehydration of the body be prevented?

Ans – If ORS (oral rehydration solution) is intake or a decent amount of water is taken then a body can be hydrated.

Q- 8 Name the vectors of the following diseases –

  1. Malaria – Protozoa – Female anopheles mosquito
  2. Dengue – Mosquito – Aedes mosquitoes
  3. AIDS – Virus – Human Immunodeficiency Virus (HIV)
  4. Amoebiasis – Protozoa
  5. Kala-azar – Protozoa – Leishmania
  6. Sleeping sickness – parasite – Trypanosoma
  7. Peptic ulcers – bacteria – Helicobactor pylori
  8. Elephantiasis – Mosquito – lymphatic filariasis

Q- 9 Name the following deficiency diseases :

  1. Disease caused by the deficiency of Iodine –

Ans – Goitre

  1. Disease caused by the biting of dog –

Ans – Rabies

  1. Disease caused by the deficiency of Iron –

Ans – Anemia

  1. Disease caused by the deficiency of Vitamin C –

Ans – Scurvy

Q- 10 Name the disease agents and the disease caused by agents?

Disease agents ——- Disease caused by them

  1. Bacteria – Tuberculosis, Typhoid, Cholera
  2. Viruses – Common cold, AIDS, Chicken pox
  3. Fungi – Ringworm, skin infection
  4. Protozoa – Malaria, Kala – azar, sleeping sickness
  5. Worms – Filariasis, Ascariasis

Q- 11 Define – (a) Immunization (b) Immune system (c) Immunity

Ans – (a) Immunization – Immunization is injecting vaccine for preventing from a particular diseases.

(b) Immune system – It is the system of our body which protects us from diseases.

(c) Immunity – It the ability of our body to fight with the external agent in our body for protecting from a disease.

Q- 12 What are the causes when we get disease?

Ans – Causes of disease –

  1. Poor immune system
  2. Unhygienic food and environment
  3. Infected by micro-organisms
  4. Genetic factors

Q- 13 What are the diseases caused by the spread of –

  1. Air borne disease – Influenza, Tuberculosis, Measles, Mumps
  2. Water borne disease – Typhoid, Hepatitis, Pneumonia, Cholera
  3. By physical contact – Polio, Covid

Q- 14 Write any two examples for these types of diseases-

  1. Acute Diseases – Cold, fever, Cough etc.
  2. Chronic Diseases – AIDS, Cancer, Diabetes etc.
  3. Infectious Diseases – Malaria, Typhoid, Cholera etc.
  4. Non-infectious Diseases – Diabetes, Heart attack, Cancer etc.
  5. Genetic Diseases – Haemophilia, sickle-cell anemia etc.

Q- 15 Write the target organs for the following –

  1. Fungal infection targets – Skin
  2. Fits targets – Brain
  3. Tuberculosis targets – Lungs
  4. Hepatitis targets – Liver
  5. Jaundice targets – Liver
  6. Pneumonia targets – Lungs

Q- 16 Vaccine is firstly discovered by whom? Name any two diseases prevented by using vaccines.

Ans – Vaccine is discovered by Edward Jenner. Small pox and polio can be prevented by vaccines.

Q- 17 Name any two groups of micro-organisms from which can be cured by antibiotics?

Ans – These are the groups – Bacteria, Fungi

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