Question:

Which of the following is correct about nematocyst?

Updated On: Aug 1, 2022
  • It can be re-used
  • It is excretory organ in arthropods
  • It is ejected on contact and pierce the prey
  • None of these
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The Correct Option is C

Solution and Explanation

Nematocysts are the stinging cells and are the organs of offence and defence of coelenterates, Nematocyst contains a poisonous proteinaceous fluid hypnotoxin along tube which injects the fluid into the victim. Nematocysts are activated in response to chemicals secreted by prey. They explode after coming in contact with the prey.
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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