Question:
Infective stage of Ascaris lumbricoides to man is:
Infective stage of Ascaris lumbricoides to man is:
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In Ascaris, infective stage = embryonated egg containing L3 larva.
Updated On: Jun 20, 2026
- 2nd stage rhabditiform larva
- 1st stage rhabditiform larva
- 3rd stage larva
- 4th stage larva
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The Correct Option is C
Solution and Explanation
Step 1: Understanding Ascaris life cycle.
Ascaris lumbricoides is a parasitic roundworm that infects humans through contaminated food and water.
Step 2: Development stages in environment.
The eggs passed in feces develop in soil and undergo multiple larval stages.
Step 3: Infective stage identification.
The infective form to humans is the third stage larva (L3) present inside embryonated eggs.
Step 4: Transmission mode.
Humans get infected by ingestion of contaminated food containing L3 larvae.
Step 5: Evaluating options.
Earlier larval stages are non-infective and develop outside the host.
Step 6: Final conclusion.
Thus, L3 larva is the infective stage.
Ascaris lumbricoides is a parasitic roundworm that infects humans through contaminated food and water.
Step 2: Development stages in environment.
The eggs passed in feces develop in soil and undergo multiple larval stages.
Step 3: Infective stage identification.
The infective form to humans is the third stage larva (L3) present inside embryonated eggs.
Step 4: Transmission mode.
Humans get infected by ingestion of contaminated food containing L3 larvae.
Step 5: Evaluating options.
Earlier larval stages are non-infective and develop outside the host.
Step 6: Final conclusion.
Thus, L3 larva is the infective stage.
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