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.
1, 2 and 3
Understanding Symbiotic Relationships
A symbiotic relationship is a close and long-term interaction between two different biological species. These relationships can take various forms, including mutualism (both species benefit), commensalism (one species benefits, the other is neither harmed nor helped), and parasitism (one species benefits at the expense of the other).
The question asks which of the given groups – Cnidarians, Fungi, and Protozoa – have species that can establish such relationships with other organisms.
Analyzing Each Group
1. Cnidarians and Symbiosis
Cnidarians are a diverse group of aquatic animals including corals, jellyfish, sea anemones, and hydras. Many species within this group are well-known for forming symbiotic relationships.
- Corals: Coral polyps have a mutualistic relationship with microscopic algae called zooxanthellae that live within their tissues. The algae perform photosynthesis, providing the coral with energy, while the coral provides the algae with protection and compounds needed for photosynthesis. This symbiosis is crucial for the formation of coral reefs.
- Sea Anemones: Some sea anemones form mutualistic relationships with clownfish, providing protection to the fish from predators while the fish may help keep the anemone clean and potentially deter certain fish. Anemones also have symbiotic relationships with certain algae.
Therefore, Cnidarians do establish symbiotic relationships with other organisms.
2. Fungi and Symbiosis
Fungi are a kingdom of eukaryotic organisms that includes yeasts, molds, and mushrooms. Fungi are involved in numerous symbiotic relationships, many of which are essential for ecosystems.
- Mycorrhizae: These are symbiotic associations between fungi and plant roots. The fungi help the plant absorb water and nutrients from the soil, while the plant provides the fungi with carbohydrates produced during photosynthesis. This is a widespread and vital mutualistic relationship.
- Lichens: A lichen is a composite organism arising from algae or cyanobacteria living among filaments of multiple fungi in a symbiotic relationship. This is typically viewed as mutualistic, although the exact nature can be complex. The fungus provides structure and protection, while the photosynthetic partner provides food.
- Endophytes: Fungi living within plant tissues without causing disease also represent symbiotic relationships, which can range from commensalism to mutualism, sometimes providing benefits like increased plant resistance to stress or pathogens.
Thus, Fungi are extensively involved in symbiotic relationships with other organisms.
3. Protozoa and Symbiosis
Protozoa are a diverse group of single-celled eukaryotic organisms. Many protozoa are free-living, but a significant number form symbiotic relationships, including parasitic ones, with other organisms.
- Termite Gut Protozoa: Termites are famous for their ability to digest wood, which is primarily cellulose. They cannot do this on their own; they rely on symbiotic protozoa (and often bacteria within the protozoa) living in their gut to break down cellulose. This is a mutualistic relationship benefiting both the termite and the protozoa.
- Parasitic Protozoa: Many diseases in humans and animals are caused by parasitic protozoa, such as malaria (Plasmodium), amoebiasis (Entamoeba histolytica), and giardiasis (Giardia lamblia). Parasitism is a type of symbiotic relationship where the protozoan benefits at the host's expense.
- Protozoa in Ruminant Stomachs: Ruminant animals (like cows and sheep) host large populations of protozoa in their digestive system which help ferment plant material.
Therefore, Protozoa also establish symbiotic relationships with other organisms.
Conclusion
Based on the examples above, species from Cnidarians, Fungi, and Protozoa are all capable of establishing symbiotic relationships with other organisms. This means that statements 1, 2, and 3 are all correct.
Looking at the options:
- 1. 1 and 2 only
- 2. 2 and 3 only
- 3. 1 and 3 only
- 4. 1, 2 and 3
The option that includes all three groups is option 4.
| Organism Group | Example of Symbiosis | Type of Symbiosis |
|---|---|---|
| Cnidarians (e.g., Coral) | Coral with Zooxanthellae (algae) | Mutualism |
| Fungi (e.g., Mycorrhizae) | Fungus with Plant Roots | Mutualism |
| Fungi (e.g., Lichen) | Fungus with Algae/Cyanobacteria | Mutualism (mostly) |
| Protozoa (e.g., Termite gut flagellates) | Protozoa in Termite Gut | Mutualism |
| Protozoa (e.g., Plasmodium) | Protozoa causing Malaria in Humans | Parasitism |
Revision Table: Key Concepts in Symbiosis
| Term | Definition | Example |
|---|---|---|
| Symbiosis | A close, long-term interaction between different biological species. | All examples discussed above. |
| Mutualism | Both species benefit from the interaction. | Coral and zooxanthellae. |
| Commensalism | One species benefits, the other is neither harmed nor helped. | Remoras riding on sharks (less common in the groups discussed here). |
| Parasitism | One species (parasite) benefits at the expense of the other (host). | Plasmodium protozoa in humans. |
Additional Information on Symbiotic Organisms
Symbiotic relationships are crucial for the survival and functioning of many ecosystems. They drive nutrient cycles, provide structural habitats (like coral reefs), and enable organisms to access resources they couldn't otherwise utilize.
The ability to form symbiosis is widespread across the tree of life, appearing in bacteria, archaea, protists (like protozoa and algae), fungi, plants, and animals (like cnidarians).
Understanding these interactions is key to understanding biodiversity and ecosystem dynamics. Many complex organisms, including humans, rely on symbiotic microorganisms (like gut bacteria and protozoa) for digestion and health.
Important Questions from Ecology and Functions of an ecosystem
An ecosystem consists of:
The phosphorus cycle is unusual because it is entirely:
Which of the following constitute a food chain ?
In the nature, which of the following is/are most likely to be found surviving on a surface without soil?
1. Fern
2. Lichen
3. Moss
4. Mushroom
Select the correct answer using the code given below.
What is blue carbon?
