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The infective stage of Ascaris lumbricoides is _________

(a) First stage Rhabditiform larva

(b) Second stage Rhabditiform larva

(c) Third stage Rhabditiform larva

(d) Fourth stage Rhabditiform larva

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I would like to ask this question from Helminthic Diseases in Humans-2 topic in division Human Health and Disease of Biology – Class 12

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Right choice is (b) Second stage Rhabditiform larva

For explanation: Second stage Rhabditiform larva is the infective stage of Ascaris lumbricoides. Infective eggs of Ascaris remain viable for six years. The larva is called Rhabditiform for its close resemblance with Rhabditis (Free-living nematode). The transmission of the infective stage through embryonated egg takes place by contaminated food and water.

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