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UPSC 2021: Which of the following have species that can establish symbiotic relationship with other organisms? 1. Cnidarians 2. Fungi 3. Protozoa Select the correct answer using the code given below:
(a)1 and 2 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
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Not attemptedCorrect Answer: (d) 1, 2 and 3
Many cnidarians (e.g., reef-building corals) live in mutualistic association with zooxanthellae algae; numerous fungi form mycorrhizae with plant roots or lichens with algae/cyanobacteria; several protozoa (e.g., cellulose-digesting flagellates in termite guts) also engage in obligatory symbioses. Therefore, all three groups listed include species capable of forming symbiotic relationships. ([iasuniverse.com](https://www.iasuniverse.com/answers-with-explanation-upsc-prelims-gs1-paper-2021/3/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2021 Science & Technology question?▼
The correct answer is option (d): 1, 2 and 3. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2021, GS Paper 1, as Question 30. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.