Question:

In fast swimming fishes, propulsion is due to

Updated On: Jul 5, 2022
  • pelvic fin
  • pectoral fin
  • dorsal fin
  • caudal fin
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The Correct Option is D

Solution and Explanation

In fast swimming fishes, propulsion is due to caudal fin. Caudal fin has an important role in fish movement. As they pass backward, a progressively greater transverse amplitude of the waves propel them forward. One wave created due to caudal fin is followed by the another and so an. This transmits a backward momentum to push the water backwards. Thus the whole body operates as a single self propelling system, and the fish is thrust forward.
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Concepts Used:

Animal Kingdom

Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.

Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.

The different phyla of the Kingdom Animalia are as follows:

  1. Porifera
  2. Coelenterata (Cnidaria)
  3. Platyhelminthes
  4. Nematoda
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata
  10. Chordata

Read More: Classification of Animal Kingdom