Question

Assertion: There is a chance of transmission of malaria parasite to the man who has received a bite of a female Anopheles mosquito

Reason: Symptoms reoccur depending upon the species of Plasmodium

• A. Both assertion and the reason are true and the reason is a correct explanation of the assertion
  
• B. Both the assertion and reason are true but the reason is not a correct explanation of the assertion
  
• C. Assertion is true but the reason is false
  
• D. Both the assertion and reason are false
  

Answer 1

The correct option is B Both the assertion and reason are true but the reason is not a correct explanation of the assertion


Sporozoites are present in the salivary gland of infected female Anopheles mosquitoes. When these mosquitos take a blood meal, they deposit saliva which has an anticoagulant. If the mosquito is infected, the sporozoites along with saliva get transferred. So there is a chance of transmission of malaria parasite to the man who has received a bite of a infected female Anopheles mosquito.
In the human host, symptoms appear during the erythrocytic stage of Plasmodium cycle which is also known as blood cycle. The symptoms reappearance vary from 48 hours to 72 hours depending upon the Plasmodium species. Plasmodium vivax, P. ovale, and P. falciparum has a gap of 48 hours for reoccurance of fever while Plasmodium malariae has a gap of 72 hours for reoccurance of fever. So, both the assertion and reason are true but the reason is not a correct explanation of the assertion.