Animal Kingdom Question 169
Assertion : Microfilariae can be detected from peripheral human blood only during night. Reason : Microfilariae remain in active state throughout day time.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: C
Solution:
In blood of man, microfilariae show day and night periodicity, called nocturnal rhythm.
By day, they live in large deep seated blood vessels, but at night and during sleep, they come into superficial or peripheral vessels in the skin, to be sucked by nocturnal mosquitoes (Culex or Aedes) which serve as intermediate hosts.
In places where diurnal mosquitoes are found, they reverse this periodicity.
Microfilariae in human blood eventually die when ingested by the intermediate host, which sucks blood from an infected human.
BETA
