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Question no 18and19

Dear Student

18. 
a) 

In biology, vector is defined as an agent which can carry some substance or information from one place to another. There are various types of vectors : 

 1) Insect vectors: Some insects like mosquitoes, lice act as vectors and transfer disease causing microorganisms from one organism to another. 

 2) Cloning vectors: These are used to transfer DNA from one cell to another. 

 b) Vector of Malaria - bites of infected female Anopheles mosquitoes
Malaria is caused by protozoa of the genus Plasmodium.

c) Disease caused by bacteria - Typhoid
Disease caused by Virus - Chicken pox

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As18)a)?disease vector?is any agent which carries and transmits an infectious pathogen into another living organism; most agents regarded as?vectors?are organisms, such as intermediate parasites or microbes, but it could be an inanimate medium of infection such as dust particles.

B) vector of malaria is Anopheles mosquito and microbe is plasmodium.

C) disease by bacteria= cholera
Disease by virus = influenza
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