Question

Cnidoblasts are present in
1. Porifera
2. Cnidaria
3. Annelida
4. Ctenophora

Answer 1

Correct Answer - Option 2 : Cnidaria

The correct answer is Cnidaria.

• Cnidoblast
  • It is a specialized cell containing one giant secretory organelle or cnida that defines the phylum Cnidaria. Hence, Option 2 is correct.
  • This is a stinging cell present in the coelenterates which helps them to protect themselves from any prey.
  • Cnidoblasts release hypnotizing which paralyzes the prey or even may result in death.
  • Cnidoblasts are the distinctive feature of the phylum Cnidaria.
  • These are present on the body surface and tentacles.
  • These are functional cells found in the tentacles of jellyfish capable of projecting a thread-like structure as a form of self-defense from other animals or to capture prey.

Porifera	The phylum Porifera comprises the sponges. Sponges are simple invertebrate animals that live in aquatic habitats. Although the majority of sponges are marine, some species live in freshwater lakes and streams.
The annelids	It is also known as the ringed worms or segmented worms, which are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.
Ctenophora	It comprises a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide.