Which among the following is the causative agent of dengue disease?

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Dengue fever is an infectious disease caused by Flavivirus (virus). It is transmitted by female Aedes mosquitoes.

Why did milkmaids who had cowpox do not suffer from smallpox later?

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Since small pox virus is closely related to cowpox virus, the milkmaids who had cowpox became resistant to the smallpox virus.

The childhood immunization programmes are important, because ____.

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Childhood immunization programmes are important to prevent infection later on in life.

Marasmus is a ____ disease.

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Marasmus is a form of severe protein energy malnutrition characterized by loss of weight. The affected persons are irritable and voraciously hungry.

It is difficult to make anti-viral medicines, because ____.

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Viral cells have few bio-chemical mechanisms of their own. They enter into our body cells and use our cellular machinery for their life processes.

Type of Hepatitis caused by a DNA virus ____.

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Only Hepatitis B is caused by a DNA virus, all other types of hepatitis are caused by RNA viruses.

An example of a disease caused by protozoan is ____.

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Kala-azar is caused by the protozoan, Leishmania donovani. It is transmitted by sand fly.

Uncontrolled growth in the number of cells in any part of the body is called ____.

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Cancer is the uncontrolled division of cells in any part of the body. Cancer can develop in any part of the body.

The vector for sleeping sickness is ____.

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The parasite that causes sleeping sickness is Trypanosoma gambiense, a protozoan. It is transmitted to humans through the bite of tse-tse fly.

The first antibiotic was isolated from ____.

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The first antibiotic, penicillin was isolated from the fungus is Penicillium notatum.

Hepatitis A is transmitted through ____.

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Transmission of Hepatitis A takes place by ingestion of contaminated food, water or milk.

____ organism is considered as a biological warfare.

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Bacillus anthracis is extremely stable. It can be stored almost indefinitely as a dry powder. It can be loaded, in a freeze-dried condition, in munitions or disseminated as an aerosol with crude sprayers.

Which of the following is an example of killed vaccine?

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In the vaccines for whooping cough, the bacteria Bordotella pertusis is killed by heat or chemicals.

Inflammation is caused due to the escape of chemical from the damaged tissue. The chemical is ____.

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Escape of chemicals like histamine and 5-hydroxytryptamine from the damaged tissues causes inflammation.

Which of the following is not a symptom, if a pathogen attacks brain?

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Jaundice is caused due to malfunction of liver, but not because of brain.

An antigen is isolated from the micro-organism for a ____.

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In case of influenza vaccine, the important antigen is isolated from the micro-organism.

Tuberculosis causing bacteria are entered into the human body through ____.

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TB is an air-borne disease and their microbes enter into the lungs through nose of humans.

____ is a metabolic disease.

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Diabetes is caused intrinsically due to decrease in levels of hormone insulin secreted by the pancreatic gland present in the body. Hence it is a metabolic disease.

An example of a degenerative disease is ____.

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Arthritis is a degenerative disease in which there is general wearing out or degeneration of the tissues especially bones in old age.

DDT is no longer used in the chemical control of mosquitoes, because it ____.

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DDT persists in the environment for a long time and causes toxicity by accumulation in the body of fishes, birds and humans through food chains.

The type of leucocytes is mainly involved in cell and antibody mediated immunity are ____.

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T and B-lymphocytes of leucocytes are mainly involved in bringing about cell and antibody mediated immunity.

Hydrophobia is a characteristic of ____.

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In rabies, the patient develops fear for water. This is called hydrophobia.

Which type of immunity provides protection to a new born baby?

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A new born baby gets antibodies from mother through breast milk. So, it is a type of natural passive immunity.

Which of the following is true about non-infectious diseases?

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Non-infectious diseases are restricted to the patient and do not spread to a healthy person.

Filarial disease is mainly spread by ____ mosquitoes.

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Filariasis is transmitted by the bites of female Culex species of mosquito.

Scurvy is caused due to deficiency of vitamin ____.

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Scurvy is a disease resulting from insufficient intake of vitamin C. It is characterized by general weakness, swollen and bleeding gums, fatigue and bleeding into body's muscles and joints etc.

In the immunization programmes for children, OPV stand for ____.

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Oral Polio Vaccine is given orally to the children of age group 5 years as per the national immunization programmes of our country. OPV is a live attenuated vaccine.

____ is an example of air-borne disease.

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Pneumonia is an air-borne disease that spreads through the droplets by an infected person who sneezes or coughs.

Which of the following inhibits protein synthesis in bacteria?

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Tetracycline interferes with bacterial ribosomes and inhibits protein synthesis.

The type of immunity that carries out a person from cold is ____ .

Correct! Wrong!

The person’s body is actively fighting against the infection naturally without any artificial help. Hence it is a type of natural active immunity.

ICSE Class 9th Biology - Diseases MCQs
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