Question

Tentacles of ctenophores contain
A. Cnidoblasts
B. Colloblasts
C. Digestive glands
D. All of the above

Answer 1

Hint: Ctenophores belong to the phylum of invertebrate animals that do not have vertebral columns. They are aquatic animals and they are present in marine water worldwide. These organisms swim with the need of cilia. They are the largest animals that swim due to the presence of cilia.

Complete Answer:
Ctenophores are the group of marine invertebrates that constitute the phylum Ctenophores. Their most important feature is the presence of cilia which helps them in movement. They show the presence of an egg-shaped body that is covered with tentacles. On the little tentacles, a cover of sticky cells is present. The function of these cells is to capture prey as predators of small as well as large animals.

Now let us find solution from given options:
- Cnidoblasts: These are also called stinging cells and they are present inside the cnidocyte. They are used to capture prey.
- Colloblasts: Colloblasts are defined as the type of cells that are present in ctenophores, these cells are found in their tentacles which help them to capture their pretty.
- Digestive glands: These glands perform two functions that are digestion and circulation so called as gastrovascular cavity. These are present inside the digestive system.

Our required option is B that is colloblast.

Note: The colloblast cells were first observed in 1844. Ctenophora was first observed in 1671 by a doctor named Martens. It was later categorized under the group zoophyte by Linnaeus. The order Ctenophora was first developed in 1829 under Coelenterata by Eschscholtz. It shows a characteristic feature of light emission called bioluminescence, which was first noticed by Charles Darwin.