How do nematocysts work for Cnidarians?

The nematocyst is a coiled thread-like stinger. When the nematocyst is called upon to fire, the thread is uncoiled, and springs straight. The harpoon-like thread punctures through the cnidocyte wall and into the prey. Most Cnidarians also have a toxin in their stinger which helps to disable the prey.

1. What is the function of the nematocysts in cnidarians?
2. What are nematocysts and how do they work in cnidarians?
3. How do nematocysts help cnidarians survive?
4. How do nematocysts perform its function?
5. How a nematocyst is triggered?
6. How does a tissue in the Cnidaria differ from the cells in a sponge?
7. Are sexes separate in cnidaria?
8. What are the functions of tentacles?
9. How do Cnidarians defend themselves?
10. Which organism captures its prey using nematocysts?
11. Do cnidarians have a Coelom?
12. How do cnidarians maintain homeostasis?
13. What is Nematocyst Class 9 answer?
14. How many kinds of nematocysts are present in Cnidarians?
15. What do you know about nematocysts?

What is the function of the nematocysts in cnidarians?

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 are nematocysts and how do they work in cnidarians?

A nematocyst is a specialized organelle found in all cnidarians. Each nematocyst features a coiled, threadlike tube lined with a series of barbed spines. The nematocyst is used to capture prey and may also be used for defense purposes.

How do nematocysts help cnidarians survive?

Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells. Nematocysts contain coiled threads that may bear barbs.

How do nematocysts perform its function?

Each is produced by a special cell called a cnidoblast and contains a coiled, hollow, usually barbed thread, which quickly turns outward (i.e., is everted) from the capsule upon proper stimulation. The purpose of the thread, which often contains poison, is to ward off enemies or to capture prey.

How a nematocyst is triggered?

The cell's thread is coiled under pressure and wrapped around a stinging barb. When potential prey makes contact with the tentacles of a polyp, the nematocyst cell is stimulated. ... The barbs at the end of the nematocyst are designed to stick into the polyp's victim and inject a poisonous liquid.

How does a tissue in the Cnidaria differ from the cells in a sponge?

Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

Are sexes separate in cnidaria?

Cnidarians have separate sexes and have a lifecycle that involves morphologically distinct forms. These animals also show two distinct morphological forms—medusoid and polypoid—at various stages in their lifecycle.

What are the functions of tentacles?

Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats.

How do Cnidarians defend themselves?

Cnidarians defend themselves and catch prey using their tentacles, which have cells called cnidocytes at their tips.

Which organism captures its prey using nematocysts?

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.

Do cnidarians have a Coelom?

Most complex, multicellular animals have a coelom. Cnidarians are not considered to have a coelom because they are diploblastic, so they don't have any mesodermic tissue. Cnidaria are a phylum consisting of aquatic animals like jellyfish, anemones, and corals.

How do cnidarians maintain homeostasis?

Cnidarians secrete hormones from glands that allow them to maintain homeostasis. They use direct diffusion in order to circulate the necessary nutrients through its body.

What is Nematocyst Class 9 answer?

Solution. The stinging cells present at tentacles of aquatic animals like jelly fish, hydra, etc in phylum coelenterata is called nematocyst (cnidoblast)

How many kinds of nematocysts are present in Cnidarians?

Across Cnidaria,~30 different types of nematocysts exist with high diversity amongst Medusozoa [180]. The diversity and complexity of nematocysts increased through evolution, from Anthozoa to Medusozoa and species are reported to each have between 2-6 different types [180] .

What do you know about nematocysts?

Inside the nematocyst is a thread-like, coiled, hollow tube with toxic barbs. This tube is everted from the capsule to deliver a paralyzing sting to the target prey or enemies. Thus, nematocysts are chiefly for food gathering and defense mechanism of Cnidarians.