Question:

Absence of circulatory system in Hydra is compensated by

Updated On: Jul 6, 2022
  • Pseudocoelomic fluid
  • Gastrovascular cavity
  • Presence of tentacles
  • None of these.
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The Correct Option is B

Solution and Explanation

Hydra is relatives of corals and jellyfish. All these species are members of the phylum Cnidaria characterized by symmetrical bodies crowned by 10-12 tentacles and an opening called a gastrovascular cavity. This class of organisms don't have a specialized circulatory system. They have a thin layer of cells which when coming in contact with water absorb the nutrients and oxygen required by the body.
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Notes on Kingdom Animalia

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