GSEB Solutions for Class 9 Science and Technology – The Why do we fall ill? (English Medium)
GSEB SolutionsMathsScience
Exercise 91:
Solution 1.1:
B. Malaria
Malaria is caused by a protozoan and can spread from one person to another. Hence, it is an infectious disease.
Solution 1.2:
A. Virus
AIDS is caused by a virus that belongs to the group of Retrovirus. It is called HIV (Human Immunodeficiency Virus).
Solution 1.3:
C. Liver
Jaundice is caused by Hepatitis viruses and it affects the liver.
Solution 1.4:
B. Mycobacterium
The bacteria called Mycobacterium tuberculosis is the causative agent of the infectious disease called T.B.
Solution 1.5:
D. All the above
Other reasons for the spread of AIDS include homosexual or heterosexual intercourse, HIV infected blood, by diseased mother to the foetus, or by infected mother to the baby by breast feeding.
Exercise 92:
Solution 2.1:
Two conditions essential for being free from the diseases are:
- Healthy environment
- Healthy food
Solution 2.2:
An acute disease is the one whose effects start suddenly in the body. Such disease acts fast on the body and lasts only for a certain period. Example – Cold, Typhoid, etc.
Solution 2.3:
Chronic diseases are long term diseases. Their effects on the body are strong and are seen for months, years or even lifetime. Example – Diabetes, Arthritis, etc.
Solution 2.4:
Following are the reasons for a disease:
- Microbial infection
- Malnourishment
- Poor health
- Unhealthy sanitary habits
Solution 2.5:
Different routes of entry of a microbe in the human body are:
- Through air, they enter via nose.
- Through mouth.
- Through sexual organs.
- Through insect bites.
- Through a cut on the skin.
Solution 2.6:
Diseases caused by bacteria are
- Cholera
- Typhoid
- T.B.
Solution 2.7:
Disease caused by virus are
- Influenza
- AIDS
- Swine Flu