Which one of the following is a true fish as per the biological system of classification?

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Q: 19 (CDS-I/2018)

Which one of the following is a true fish as per the biological system of classification?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,19,50,15,15,20,19

keywords: 

{'true fish': [1, 0, 0, 1], 'fish': [1, 2, 0, 0], 'silverfish': [3, 0, 0, 2], 'cuttlefish': [2, 0, 0, 1], 'jellyfish': [1, 0, 1, 3], 'classification': [4, 0, 1, 6], 'biological system': [1, 0, 0, 1]}

The correct answer is option 4 - Flying fish.

Option 1 - Silverfish: Silverfish is not a true fish. It is actually an insect and belongs to the class Insecta.

Option 2 - Jellyfish: Jellyfish, despite its name, is not a true fish. It belongs to the phylum Cnidaria and class Scyphozoa. They are invertebrates and have a gelatinous body structure.

Option 3 - Cuttlefish: Cuttlefish is not a true fish either. it is a marine animal that belongs to the class Cephalopoda along with squids and octopuses. They have a soft body, tentacles, and a unique internal shell.

Option 4 - Flying fish: Flying fish is the only one among the options that is a true fish. They belong to the class Actinopterygii, which is the class of ray-finned fishes. Flying fish have adapted to glide above water, using their wing-like fins to escape predators.

Therefore, out of the given options, only option 4 - Flying fish is a true fish according to the biological system of classification.

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