Question

Colloblast (adhesive) cells are the characteristic of
A. Hydra
B. Comb jelly
C. Obelia
D. All of the above

Answer 1

Hint: Colloblast cells are the characteristic feature of the largest animals that are able to swim in water with the help of cilia and also produce bioluminescence that means they illuminate light.

Complete answer:
Colloblasts are the type of cells that are found in ctenophores, these cells are found in their tentacles which help them to capture their pretty. Ctenophores are commonly called comb jelly.

Additional Information:
-Ctenophores are the group of marine invertebrates that belong to the phylum Ctenophora.
-Their characteristic feature is the presence of cilia which helps them in movement.
-They have an egg-shaped body that is covered with tentacles. These tentacles are attached with little tentacles.
-On the little tentacles, a cover of sticky cells called colloblast cells is present which captures prey.
-They mainly function as predators of small as well as large animals.
-The body of ctenophores is made up of soft jelly which is covered by a two-layered thick outer wall and an inner wall that lines the body cavity.
-Inside the epidermis of the colloblast cells, a spiral filament id deeply embedded which has an axial filament and granular dome.
-These granules, when attached to prey, will burst and secrete adhesive substances onto the prey and prevent them from escaping.

So, the correct answer is ‘Comb jelly’.

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