Select the Taxon mentioned that represents both marine and fresh water species: [2014]a)Echinodermsb)Ctenophorac)Cephalochordatad)CnidariaCorrect answer is option 'D'. Can you explain this answer?

Question

Select the Taxon mentioned that represents both marine and fresh water species:    [2014]a)Echinodermsb)Ctenophorac)Cephalochordatad)CnidariaCorrect answer is option 'D'. Can you explain this answer?

Answer

Cnidarians are the sac-like animals which are aquatic, mostly marine except a few like Hydra, are fresh water. They are the simplest organisms that have attained a tissue level of organization.

Ctenophora, Cephalochordata and Echinodermata are exclusively marine.

Answer

Cniderians r aquatic but mostly marine
Ctenophora, echinodermata and cephalochordata r exclusively marine only.... Refer ncert bio class 11

Answer

Cnidaria is true because they are aquatic and mostly marine they are sac like animals

Answer

Echinoderms:
- Echinoderms are a phylum of marine animals that include sea stars, sea urchins, and sea cucumbers.
- They are exclusively found in marine environments and do not inhabit freshwater.

Ctenophora:
- Ctenophora, commonly known as comb jellies, are a phylum of marine animals.
- They are found in marine environments and are not known to inhabit freshwater.

Cephalochordata:
- Cephalochordata, also known as lancelets or amphioxus, are a small group of marine animals.
- They are exclusively found in marine environments and do not inhabit freshwater.

Cnidaria:
- Cnidaria is a phylum that includes animals such as jellyfish, sea anemones, and corals.
- While the majority of cnidarians are marine species, some cnidarians, such as jellyfish, have a life cycle that includes both a marine and freshwater stage.
- The polyp stage of jellyfish can be found in freshwater, while the medusa (jellyfish) stage is typically found in marine environments.
- Therefore, cnidarians represent both marine and freshwater species.

Conclusion:
Among the taxons mentioned, only cnidaria represents both marine and freshwater species. Echinoderms, ctenophora, and cephalochordata are exclusively found in marine environments and do not inhabit freshwater.

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