This document defines key health-related terms like health, healthy, and disease. It also lists factors responsible for good health such as environment, balanced diet, public cleanliness, and social well-being. The document differentiates between acute and chronic diseases as well as communicable and non-communicable diseases. It names diseases caused by protozoans, bacteria, fungi, and viruses. In the test yourself section, it asks the reader to define terms, name constituents of a balanced diet, and differentiate between disease types and list factors for good health.

1. Science
revision
By Vardhan basuraj

2. Define the following.
1. Define the term “health”.
Ans : Heath is state of being well enough to function well physically, mentally
and socially.
2. Define the term “healthy”.
Ans : A person being completely well socially, physically and mentally can
be called healthy.
3. Define the term “disease”.
Ans : Disease is the disturbance caused in the functional of any organ or any
part of the body due to attack of pathogen and lack of balanced diet.

3. Answer the following briefly.
1. List the factors responsible for good health.
Ans : The factors responsible for good health are :
• Environment.
• Balanced diet.
• Public cleanliness.
• Social well being.
• Harmony.
2. Explain how environment is responsible for good health.
Ans : Everyone lives in a environment but if the environment which they live in is not clean and
unhealthy can cause major effects on the person living. For example, in an village if the rackpickers
dont clean the surroundings the garbage would gather and it would cause a major effect on the people
living in the surrounding.

4. Differentiate.
1. Write the difference
between acute and
chronic disease.
Ans
Acute Diseases Chronic Diseases
These diseases occur
suddenly.
They occur over a prolonged
period.
They last for a shorter
period.
They last longer, even for a
lifetime.
They cause sudden damage
to the body.
They cause long term
damage to the body of the
patient.
The onset is sudden and
often treatable. However,
other underlying conditions
can also affect the outcome
of the disease.
Chronic diseases progress
gradually and usually end up
causing long term damage to
organs and organ systems.
In some cases, it can
become fatal.
E.g. Typhoid, bone fracture,
heart attack, cholera,
common cold, jaundice,
malaria, etc.
Eg. Diabetes, cancer,
tuberculosis, arthritis, etc.

5. 2. Differentiate between
infectious(communicable)
and noninfectious ( non –
communicable ) diseases.
Ans :
Infectious Diseases Non-Infectious Diseases
They are caused by
infectious microorganisms
like viruses, bacteria,
helminths, etc.
They are caused by
pathogens as well has due
to old age, nutritional
deficiency, smoking,
drinking, lifestyle, etc
The mode of transmission
can be fecal-oral, droplets,
sexual transmission, direct
contact or transmission by
vector.
These do not transmit from
one person to another, but
some of them may be
genetically inherited.
AIDS, Herpes, Cholera,
Polio, Tuberculosis, Pox
Cancer, Diabetes, Liver
Cirrhosis, Colour Blindness.

6. Name the
following.
Name 2 diseases caused by protozoans, bacteria, fungi and virus
?
Ans : protozoans :
• Kala azar.
• Sleeping sickness.
Bacteria :
• Acne.
• Tuberculosis.
Fungi :
• Skin infection.
• Food poison.
Virus :
• Influenca.
• Aids

7. Test
yourself.
What is balanced diet ?
Name the constituents of balanced diet ?
Difference between communicable and non communicable diseases ?
Name any three factors responsible for good health.
Define the term.
Health.
Diseases.
Healthy.