Question:
Assertion (A): Ascaris lumbricoides completes its entire life cycle within the small intestine.
Reason (R): Larvae of Ascaris undergo extra intestinal migration.
Assertion (A): Ascaris lumbricoides completes its entire life cycle within the small intestine.
Reason (R): Larvae of Ascaris undergo extra intestinal migration.
Show Hint
*Ascaris* larvae take the scenic route (liver $\rightarrow$ heart $\rightarrow$ lungs) before becoming adults in the intestine.
Updated On: Jun 10, 2026
- Both (A) and (R) are true. (R) is the correct explanation for (A)
- Both (A) and (R) are true. (R) is not the correct explanation for (A)
- (A) is true. But (R) is false
- (A) is false. But (R) is true
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Concept
Life cycle of the parasitic nematode *Ascaris lumbricoides*.
Step 2: Analysis
The assertion is false because *Ascaris* does not complete its entire life cycle in the intestine; it requires a complex migratory path through the lungs and liver. The reason is true as the larvae indeed undergo extra-intestinal migration through the bloodstream to the lungs before returning to the intestine.
Step 3: Conclusion
The assertion is incorrect while the reasoning is correct.
Final Answer: (D)
Life cycle of the parasitic nematode *Ascaris lumbricoides*.
Step 2: Analysis
The assertion is false because *Ascaris* does not complete its entire life cycle in the intestine; it requires a complex migratory path through the lungs and liver. The reason is true as the larvae indeed undergo extra-intestinal migration through the bloodstream to the lungs before returning to the intestine.
Step 3: Conclusion
The assertion is incorrect while the reasoning is correct.
Final Answer: (D)
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