Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q114 (CDS-I/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Animal diversity behaviour Answer Verified

Which one among the following is a free living animal ?

Result
Your answer: —  Â·  Correct: D
Explanation

Among the given options, Planaria is the only free-living animal. Planarians are non-parasitic flatworms belonging to the class Turbellaria within the phylum Platyhelminthes [1]. Unlike parasites, free-living organisms like Planaria are capable of finding and digesting their own food without depending on a host [2]. In contrast, the other options are obligate parasites. Liver fluke (Fasciola) is a parasitic trematode that typically infects the livers of sheep and humans [1]. Wuchereria (specifically Wuchereria bancrofti) is a parasitic roundworm responsible for lymphatic filariasis. Plasmodium is a parasitic protozoan that requires two hosts—a vertebrate and an insect—to complete its life cycle and is the causative agent of malaria. Planaria is also widely studied in biological research for its remarkable ability to regrow from body fragments [2].

Sources

  1. [1] https://uou.ac.in/sites/default/files/slm/ZO(N)-101.pdf
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet > Ever heard of ... Ever heard of ... > p. 221
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
33%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

NDA-II · 2013 · Q100 Relevance score: 0.09

Which one among the following animals is not a mammal?

CDS-I · 2005 · Q87 Relevance score: -1.01

From the evolutionary point of view which one among the following is the most primitive animal in comparison to the other three ?

CDS-II · 2014 · Q10 Relevance score: -1.39

Which one among the following is the generic name of the causal organism of Elephantiasis ?

CAPF · 2019 · Q51 Relevance score: -2.24

Which of the following organisms belongs to Coelenterata (Cnidria) ?

NDA-II · 2017 · Q14 Relevance score: -2.51

Which one of the following is the scientific name of the causal organism of elephantiasis ?