The vector for malaria is

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Female Anopheles mosquito is the vector (transmitting agent) for malaria.Plasmodium is the causative organism or the pathogen; man is one of the host while stagnant water acts as the breeding ground for the mosquito.

The gametocytes are developed in the

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The gametocytes are produced in the RBC of man. Liver of man is associated with the process of asexual reproduction. Salivary glands of the mosquito help in the storage of the sporozoites while the process of fertilization takes place in the intestine of the mosquito.

To complete its lifecycle, the malarial parasite requires

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For completing its lifecycle the malaria parasite requires two hosts-man and female Anopheles mosquito and the primary host - female Anopheles mosquito is also called vector. The mosquito thus acts as both the host and the vector.

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.

Sporogony takes place in

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Sporogony takes place in the intestine of the mosquito. The sporozoites thus formed migrate to the salivary glands of the mosquito.

____ is a soil born disease.

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Tetanus is an infectious disease caused by contamination of wounds from bacteria. The bacteria "Clostridium tetani" is the cause of tetanus which lives in the soil in the form of spores.

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.

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.

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.

In the human host, the sporozoites first reproduce asexually in the

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The sporozoites first reach the liver through the blood and reproduce asexually in the liver tissues. From here they are then released into the RBC of man.

Filarial disease is mainly spread by ____ mosquitoes.

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

In the mosquito, the sporozoites are stored in the

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The sporozoites are stored in the salivary glands of the mosquito.

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.

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 immunity that carries out a person from cold is____.

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

Which one of the following causes malignant malaria?

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Plasmodium falcipuram causes a malignant form of malaria which is often fatal.

Which of the following is false about a person who has suffered from smallpox and recovered?

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Even in case of an epidemic, he will not suffer from small pox since he has now become resistant to further attacks of smallpox.

____ 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.

Shivering in malaria is caused due to

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The symptoms of malaria are shown because of release of a toxin haemozoin. This is released when the RBC's rupture.

Sexually transmitted diseases are spread by casual physical contact.

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Sexually transmitted diseases are mostly spread by sexual contact, blood transfusion and drug abuses.

Which of the following inhibits protein synthesis in bacteria?

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Tetracycline interferes with bacterial ribosomes and inhibits protein synthesis.

The childhood immunization programmes are important, because ____.

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

The infectious form of the Plasmodium is

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The sporozoites are the infectious stages of the pathogen. Gametocytes are the sexual stages while trophozoite is the feeding stage of the pathogen.

Potential vector for malaria are ____.

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Malaria is caused by a parasite called Plasmodium, which is transmitted by the infected mosquito bite.

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.

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.

What enters the mosquito when it bites an infected person?

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The female mosquito takes up gametocytes when it bites an infected person.

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.

A person bitten by a poisonous snake is given an Anti venom injection, which causes ____.

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In artificial passive immunity, the person’s body is receiving the antibodies without any antibody production in his body. Antivenom consists of antibodies developed against snake bite in other animals like horse.

The first antibiotic was isolated from ____.

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

ICSE Class 9th Biology - Diseases caused by micro organisms MCQs
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