Question:
1. Caenorhabditis elegans is a nematode which is
1. Caenorhabditis elegans is a nematode which is
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C. elegans lives freely in soil and causes no disease.
Updated On: Oct 22, 2026
- Free living and non-pathogenic
- Endoparasitic and pathogenic
- Free living and pathogenic
- Ecto-parasitic and non-pathogenic
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The Correct Option is A
Solution and Explanation
Step 1: Recall the organism:
Caenorhabditis elegans is a tiny roundworm (nematode), about 1 mm long.
It lives in the soil and feeds on bacteria. It is used as a model organism in genetics, and its genome was sequenced along with the Human Genome Project.
Step 2: Decide the two features:
Free living means it lives independently and does not depend on a host.
Non-pathogenic means it does not cause disease in humans or other organisms.
Step 3: Check the options:
(A) matches both features, so it is correct.
(B) is wrong because it is not a parasite inside a host.
(C) is wrong because it is free living but not pathogenic.
(D) is wrong because it does not live on the outside of a host and feed on it.
Final Answer:
The nematode is free living and non-pathogenic. The correct option is (A).
Caenorhabditis elegans is a tiny roundworm (nematode), about 1 mm long.
It lives in the soil and feeds on bacteria. It is used as a model organism in genetics, and its genome was sequenced along with the Human Genome Project.
Step 2: Decide the two features:
Free living means it lives independently and does not depend on a host.
Non-pathogenic means it does not cause disease in humans or other organisms.
Step 3: Check the options:
(A) matches both features, so it is correct.
(B) is wrong because it is not a parasite inside a host.
(C) is wrong because it is free living but not pathogenic.
(D) is wrong because it does not live on the outside of a host and feed on it.
Final Answer:
The nematode is free living and non-pathogenic. The correct option is (A).
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