Question
Biology Question on human health and disease
Which one of the following is the infective stage of Ascaris lumbricoides?
A
Unsegmented egg
B
Egg with first stage larva
C
Egg with second stage larva
D
Free third stage larva
Answer
Egg with second stage larva
Explanation
Solution
Ascaris has no intermediate host and man acquires infection by directly ingesting Ascaris eggs containing the infective second stage rhabditoid larva with contaminated food or water.