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By Savita S. More

Chhattisgarh Board Class 8 Science Chapter 16 Solution

Last updated on February 9th, 2024 at 04:36 pm



Fill in the blanks.

1. To avoid dehydration a sick person must frequently take ……………solution. [ORS]

2. Female Anopheles mosquito bite causes ……………..disease.[Malaria]
3. If a healthy child suddenly starts sneezing and there is watery discharge
from his nose then he may be suffering from……………disease.[Common Cold]
4. A child has one of his legs swollen and fat and the other one of normal size then he is suffering from ……………disease.[Filaria]
5. Lymph canals are affected by ……………disease.[Filaria]
6. In ……………… and ……………………………diseases the central nervous system is affected. [Polio , Rabies]
7. After entering human body the HIV destroy the ……………cells.[WBC]

Find which statements are correct and which are wrong.

1. T.A.B vaccine is against typhoid. [Incorrect]
2. Tuberculosis is caused by vibrio cholery.[Incorrect]
3. To prevent mosquito bite , mosquito nets must be used.[Correct]
4. Excreta of the persons from dysentry and diarrhoea must not be left open,but be covered by sand or ash.[Correct]
5. Using the handkerchiefs and towels used by a person suffering from cold
and flu, does not affect a healthy person.[Incorrect]
6. To prevent filarial mosquitoes must be destroyed.[Correct]
7. Rabies is caused by the bite of any dog or cat.[Correct]

Choose the correct alternative-

1. Disease caused by bacteria and virus is :-
a. hereditary disease
b. contagious disease
c. scurvy
d. non contagious disease


2. BCG is used against :-
a. polio
b. tuberculosis
c. typhoid
d. malaria


3. Which is a bacteria borne disease?
a. chickenpox
b. typhoid
c. rabies
d. influenza


4. Malaria is spread by :-
a. male culex mosquito
b. male anaphelus mosquito
c. female anaphelus mosquito
d. female culex mosquito


5. Chill and shivering is a symptom of which disease :-
a. typhoid
b. cholera
c. malaria
d. tuberculosis


6. The disease caused by a protozoa is;-
a. dysentry
b. malaria
c. diarrhoea
d. all of these.


7. Dysentry is caused due to :-
a. drinking contaminated water
b. eating too much
c. drinking clean water
d. eating salads


Answer the following questions :-

Q: What are the measures taken against prevention of tuberculosis?
Steps taken to prevent tuberculosis:
Early diagnosis and treatment of active cases of TB
Tracing and testing people who came in close contact with a TB patient
Good respiratory hygiene, such as covering the mouth and nose when coughing or sneezing
Improving public health and sanitation to reduce transmission

Q: What is dehydration ? How can you treat it?
Dehydration is a condition when the body loses more fluid than it takes in (usually through sweating, vomiting, diarrhea, or eating too little fluid). To overcome dehydration you can:
Rehydrate by drinking water, oral rehydration solution (ORS
Consume foods or beverages containing electrolytes such as sodium and potassium.


Q: If there are pits filled with water and mosquitoes breeding in it, near your house, then what diseases may infect you?
Diseases may infect us like malaria dengue and chikanguniya.


Q: If your friend is having spasms and cramps in his abdomen and is having frequent bowels. Can you tell your friend is suffering from which disease and why?
They are probably suffering from a gastrointestinal infection or illness. This may be due to gastroenteritis, food poisoning or dysentery.

Q: Name two viral diseases and their symptoms.
Two Viral diseases are Influenza and chickenpox
symtoms of Influenza are – Fever, cough, sore throat, muscle aches, fatigue, headache.
Symptoms of chickenpox are – Itchy rash with red spots and blisters, fever, tiredness


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