Answer: Option B. -> False
:
B
There are the following two ways to treat a disease.
1. Kill the cause of the disease:Each microbe undergoes some specific biochemical life process which helps them to survive. The intake of certain drugs that block these biochemical processes can help in killing the microorganism causing the disease. Antibiotics serve the purpose.
2. Reduce the effect of the disease:Medicines are provided to reduce the pain or bring down the fever. In other words, symptomatical treatment may help to reduce the impact of a disease, but it might not outright cure it. Illness like the common cold does not have a cure, hence, treating symptoms symptomatically will alleviate the discomfort or illness to an extent.

Answer: Option B. -> False
:
B
Anacute diseaseis adisease that followsa short course. Elephantiasisrefers to a parasitic infection that causes extreme swelling in the arms and legs. The disease is caused by the filarial worm, which is transmitted via the female culex mosquito.Ailments that last for a long time, even as much as a lifetime, are called chronic diseases. Elephantiasis can last for a very long time and has long-term effects on the body. Therefore, it is a chronic disease.

Answer: Option D. -> Vectors
:
D
Animals or insects carry infecting agents from a sick person to another potential host.These animals are thus the intermediaries and are termed as vectors.The most common vectors are mosquitoes.

Answer: Option B. -> Drinking boiled water
:
B

• Malaria is not a water-borne disease. It is a protozoan disease, caused byPlasmodium (a protozoa).The pathogens enterthe body of ahealthy individualvia the bite of an infected female Anopheles mosquito.


• Malaria can be prevented by installing net on windows, keeping the surroundings neat and clean and by spraying insecticides on stagnant water. This will prevent the mosquitoes around.


• Malaria cannot be prevented by drinking boiled water. It is a preventive measure against spreading of water-borne diseases.

Answer: Option B. -> Typhoid
:
B
Malaria, kala-azar and sleeping sickness are caused by protozoans and typhoid is caused by bacteria.

Answer: Option D. -> Jaundice
:
D
In very few cases when the bacteria causing tuberculosis, reach the liver, people may experience jaundice, which is the yellowing of skin or eyes.

Answer: Option B. -> False
:
B
Communicable diseases are spread when a healthy individual comes in contact with a sick person. Such diseases are also spread by vectors that carry pathogens or through contaminated food and water. Non-communicable diseases like diabetes and cancer do not spread from an infected person to a healthy person.

Answer: Option A. -> True
:
A
The vaccine consists of dead and attenuated (harmless) microbes which when exposed to the body, creates a defence attack against the microbe and destroys it. In this process, a memory of this specific microbe is created so that when the same microbe attacks an organism next time, the immunity (strength to fight) is increased and microbe is killed much quickly.

Answer: Option B. -> False
:
B
Suffering from cough and other weakness is a symptom of a disease. Signs of disease are what doctors determine on the basis of the symptoms.
Sign gives a definite indication of the presence of a particular disease whereas symptom is a feeling of something wrong.

Answer: Option A. -> Small pox
:
A
Edward Jenner discovered the vaccine for smallpox in 1798. Working in an agricultural community, Jenner knew that milkmaids never caught smallpox.However, they inevitably caught cowpox. Jenner speculated that exposure to cowpox produced immunity against smallpox and even encountered locals who claimed to have deliberately infected themselves to provoke such a response. Jenner injected an eight-year-old boy with pus from cowpox blisters on the hands ofa milkmaid and the boy developed immunity against smallpox.