Tag: contaminated water spreads disease

Questions Related to contaminated water spreads disease

Which stage of Plasmodium is infective for Mosquito

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. Trophozoite

  2. Gametocyte

  3. Ookinete

  4. Sporozoite

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Correct Option: B
Explanation:

Gametocyte is infective stage for female anopheles mosquito because optimum temperature for growth of gametocyte is present in their body.

Motile elongate zygote of Plasmodium occurs in

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. Human RBCs

  2. Human liver

  3. Salivary glands of mosquito (Anopheles)

  4. Gut of mosquito (Anopheles)

Show answer
Correct Option: D
Explanation:

The motile zygote formed by fertilization of macro gameteby a micro gameteis called ooKinete. It  occurs in gut of mosquito. 

We should not allow mosquitoes to breed in our surroundings because they

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. Multiply very fast and contaminate food

  2. Are vectors for many diseases.

  3. Bite and cause skin diseases.

  4. Are not important insects.

Show answer
Correct Option: B
Explanation:

Mosquitoes cause more human suffering than any other organism. Mosquito acts as a vector for the bacteria and viruses, responsible for the diseases such as malaria, dengue, encephalitis and yellow fever etc. When mosquito bites a human it causes severe skin irritation through an allergic reaction to the mosquito's saliva, this is what causes the red bump and itching.

Vector of malarial parasite is____________.

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. Male Culex

  2. Female Anopheles

  3. Female Aedes

  4. Female Culex

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Correct Option: B
Explanation:
Malaria is caused by Plasmodium parasites. The parasites are spread to people through the bites of infected female Anopheles mosquitoes, called "malaria vectors."

So, the correct answer is 'Female Anopheles'.

Which of the following pair is correct?

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. E. Coli - parasitic

  2. Culex - elephantiasis

  3. Bed bug - kala-azar

  4. Plasmodium - sleeping sickness

Show answer
Correct Option: B
Explanation:
Elephantiasis is painful, swelling of the legs and genital organs. It is a classic sign of late-stage disease. It is caused by Culex mosquito which carries filarial worms. 
E.coli lives in our intestine and it is not parasitic.
Kala-azar is a parasitic disease transmitted by the bite of infected female sandflies.
Sleeping sickness is a parasitic disease of humans and other animals. It is caused by protozoa of the species Trypanosoma brucei.
So the correct option is 'Culex- elephantiasis'.

State whether the following statements are true or false.
Malaria is caused by female anopheles.

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. True

  2. False

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Correct Option: B
Explanation:

The causative agent of malaria is Plasmodium vivax and female anopheles act as a vector. 

So, the correct option is 'False'.

Female Anopheles mosquito is carrier of a pathogen that causes

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. malaria

  2. dengue

  3. yellow fever

  4. filariasis.

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Correct Option: A
Explanation:

Malaria is caused by the toxins produced in the human body by malarial parasite Plasmodium. Malarial parasite is carried from the infected to the healthy persons by the female Anopheles mosquito.

What is common in both Culex and Anopheles?

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. Both sit obliquely while resting on a plane

  2. Both have dark spotted wings

  3. Both have three pairs of legs, last pair is held up in the air while sitting

  4. Both lay eggs in rafts

Show answer
Correct Option: C
Explanation:

Culex is a genus of mosquitoes which carries worms of filariasis, Japanese encephalitis, St. Louis encephalitis, and avian malaria. 
Anopheles is a genus of mosquito first described and named by J. W. Meigen in 1818. About 460 species are recognized, while over 100 can transmit human malaria. Both Culex and Anopheles have three pairs of legs, the last pair is held up in the air while sitting. 

Choose the correct answers from the alternatives given.
In the malarial parasite, oocyst is formed in the:

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. erythrocytes of man

  2. liver cells of man

  3. stomach wall of the female mosquito

  4. blood of the female mosquito

Show answer
Correct Option: C
Explanation:

The female Anopheles mosquito, when it withdraws blood the infected malarial patient, the male and female gametes enter into the mosquito gut, when the two male and female gametes fuse together and form a zygote, which develops into ookinetes that burrow into the mosquito midgut wall to develop into oocysts.

So, the correct option is 'stomach wall of the female mosquito'.

Choose the correct answers from the alternatives given.
The vector of sleeping sickness is:

evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

  1. house fly

  2. sand fly

  3. mosquito

  4. tsetse fly

Show answer
Correct Option: D
Explanation:

Trypanosoma brucei rhodesiense and Trypanosoma brucei gambiense are the two parasites causes sleeping sickness. Tsetse flies which acts as a carrier of the infection. 

So, the correct option is 'tsetse fly'.