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UPSC Prelims 2021 Paper-1 📅 10 Oct, 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
Result Summary
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UPSC Prelims
2021 • 10 Oct, 2021 • Paper-1
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.
Correct Answer
1, 2 and 3
Cnidarian Symbiosis: Many cnidarians, most notably reef-building corals, maintain a crucial mutualistic relationship with photosynthetic algae called zooxanthel......
Ref/Book : UPSC Prelims 2021
Ref. Subject Environment
Chapter -
Ref. Topic Ecology
Pg. No -
💡 Analysis & Explanation
Cnidarian Symbiosis ▼
Many cnidarians, most notably reef-building corals, maintain a crucial mutualistic relationship with photosynthetic algae called zooxanthellae, which reside within their tissues and provide them with essential nutrients. Thus, item 1 is correct.
Fungal Symbiosis ▼
Fungi are renowned for forming symbiotic associations. Mycorrhizal fungi partner with the roots of most terrestrial plants to exchange nutrients, and fungi also partner with algae or cyanobacteria to form lichens. Thus, item 2 is correct.
Protozoan Symbiosis ▼
Several species of protozoa exhibit symbiosis, such as the flagellates living in the digestive tracts of termites. These protozoa secrete enzymes that break down cellulose, allowing the host termite to digest wood. Thus, item 3 is correct.
Conclusion ▼
Species from all three biological groups are capable of forming symbiotic relationships.
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