What is the structure and function of a nematocyst?
Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte. Nematocysts are predominantly used for prey capture and defense, but also for locomotion.
What is the structure of nematocyst?
The nematocyst structure consists of a globular or egg-shape capsule, made up mainly of mini-collagens and the glycoprotein NOWA, which has an apical aperture closed by a cover (operculum) and an inverted long spiny tubule inside (11).
What 2 functions do nematocysts provide?
The two main functions of nematocysts are defence and capturing prey.
How do nematocysts work?
The nematocyst is used to capture prey and may also be used for defense purposes. When it is triggered to discharge, the extremely high osmotic pressure within the nematocyst (140 atmospheres) causes water to rush into the capsule, increasing the hydrostatic pressure and expelling the thread with great force.
What are cnidocytes and nematocysts and what is the role of these structures?
Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, and serve to immobilize prey with toxins contained within the cells. Nematocysts contain coiled threads that may bear barbs.
What is the function of the tentacles?
Tentacles are slender, flexible organs on the head. They may function in sensory perception and in actually securing food.
What is nematocyst Class 9 answer?
nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones).
Why are nematocysts important?
Are nematocysts used for reproduction?
In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula. The jellyfish sting actually comes from tiny nematocysts, or stinging cells, on the jellyfish body.
What are the 2 main locations of nematocysts?
What are the Two Major Places Where Nematocysts Can Be Found? Ans. Nematocyst cells are found across the mouth and tentacles and are used to immobilise prey by releasing toxins. They have coiled threads that might have barbs on them.
How does a nematocyst work?
How does the Nematocyst work? The nematocyst is used to capture prey and may also be used for defense purposes. When it is triggered to discharge, the extremely high osmotic pressure within the nematocyst (140 atmospheres) causes water to rush into the capsule, increasing the hydrostatic pressure and expelling the thread with great force.
What are the three types of nematocysts?
Nematocyst. This is the main type,present in all Anthozoa.
How does the nematocyst work?
How is a nematocyst triggered?
A cnida,ptychocyst,nematocyst,cnidocyst,or spirocyst is an organelle found across each cnidocyte.