Tag: evs

Questions Related to evs

The path along which light travels in a homogenous medium is called the

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. beam of light

  2. ray of light

  3. pencil of light

  4. none of these

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Correct Option: B
Explanation:

Definition:- The path a traced by light is called a ray of light. 

We can see an object from every direction due to ____________ of the incident light ray on the object.

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. regular refraction

  2. regular reflection

  3. irregular reflection

  4. none of these

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Correct Option: C
Explanation:

Irregular reflection makes us see all the objects and everything around us. If light gets regularly reflected then every object would act like a mirror and our surroundings would be illuminated. This would have a blinding effect on eyes making it harder for us to see.

A leaf which contains only green pigments, is illuminated by a laser light of wave length 0.6328 $\mu$ m. It wound appear to be:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Brown

  2. Black

  3. Red

  4. Green

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Correct Option: B
Explanation:

0.6328 $\mu m$ = $6328 \mathring A$
This is wavelength of red colour. So, this light will be absorbed by green pigments. 
The leaf will appear black.

The pathogen transmitted through female mosquito causing chronic inflammation of the lymphatic vessels of the lower limbs in man is__________

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

  1. Ascaris sp.

  2. E. histolytica

  3. Streptococcus pneumoniae

  4. W. malayi

Show answer
Correct Option: D
Explanation:

W.malayi also called as brugia malayi are the important agents of bancroftian and brugian(it is sometimes referred to as Malayan)filariasis. In contrast to many other mosquito-borne infections of medical significance, lymphatic filariae are transmitted by not just one but by several genera of mosquitoes.

So, the correct option is 'W.malayi'.

The mouth parts of Anopheles are adapted to

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

  1. Biting and chewing type feeding

  2. Piercing and sucking type feeding

  3. Chewing type feeding

  4. Sucking type feeding

Show answer
Correct Option: B
Explanation:

 Female mosquito have mouthparts that pierce food items to enable sucking of internal fluids. In female mosquitoes, all mouthparts are elongated. The labium encloses all other mouthparts like a sheath. The labrum forms the main feeding tube, through which blood is sucked. Paired mandibles and maxillae are present, together forming the stylet, which is used to pierce an animal's skin. During piercing, the labium remains outside the food item's skin, folding away from the stylet. Saliva containing anticoagulants, is injected into the food item and blood sucked out, each through different tubes.

So, the correct option is B. ( Piercing and Sucking type )

Which state 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. Sporozoite

  2. Ookinete

  3. Trophozoite

  4. Gametocyte

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Correct Option: A

The difference between Culex and Anopheles is

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

  1. Culex sits antiparallel to the substratum

  2. Anopheles sits at an angle to the substratum

  3. Anopheles sits parallel to the substartum

  4. Culex sits at an angle to the substratum

Show answer
Correct Option: B
Explanation:

Culex causes filariasis, bird malaria. Its body rests parallel to the surface or substratum. Whereas Anopheles causes malaria. The body is slender and rests at an angle to the surface or substratum.
Therefore, the correct answer is option B.

Insect that spreads plague is?

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

  1. Anopheles

  2. Pediculus

  3. Xenopsylla

  4. Yersinia

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Correct Option: A

Spread of Malaria can be best controlled by ______________.

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

  1. Killing adult mosquito only.

  2. Proper medical treatment only.

  3. Making the mosquito breeding places unsuitable for completion of life-cycle.

  4. All of the above.

Show answer
Correct Option: C
Explanation:

A malaria control method that targets mosquito larvae and pupae as they mature in standing water could be an important supplementary measure in the fight against the disease. Larval source management (LSM) is a method that targets immature mosquitoes, found in standing water before the females develop into flying adults that are capable of transmitting malaria. This is done by permanently removing standing water, for example by draining or filling land; making temporary changes to mosquito habitats to disrupt breeding, for example by clearing drains to make the water flow; or larviciding by adding chemicals or biological larvicides to standing water to kill larvae.

The parasite which has been recently eradicated from India is?

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

  1. Leishmania donovani

  2. Dracunculus medinensis

  3. Toxoplasma gondii

  4. Taenia solium

Show answer
Correct Option: A