Cnidarian worksheet zoology | Lab Reports Zoology

Cnidarian worksheet:

Name: ______________________________ Section: ____________ Date: ____________

Cnidarian Guide Questions:

1) What unique characteristics do cnidarians have?

There are several distinctive features that set cnidarians apart. They are able to understand inputs from all

directions because they have radial symmetry, a characteristic not found in other animals. Nematocysts, which

are utilized by cnidarians for defense and prey capture, are found in specialized cells known as cnidocytes.

They usually have a core gastrovascular chamber surrounded by two layers of tissue that serve both circulatory

and digestive purposes. For fundamental coordination, cnidarians have a decentralized nerve net, unlike

higher animals with centralized neural systems. Furthermore, a great deal of cnidarians display unique polyp

and medusa body shapes during their life cycle, which further increases their capacity to adapt to a wide range

of aquatic conditions. Together, these characteristics make cnidarians distinct and productive marine

environment occupants.

2) Name the tissue layers that cnidarians have. Describe the material that is between these tissues?

The inner gastrodermis and the outer epidermis are the two main tissue layers found in cnidarians. The

animal's epidermis makes up its outer layer, while the gastrodermis lines the inside of the gastrovascular

cavity. The gelatinous material known as mesoglea is located in between these two layers. Mesoglea acts as

a supporting matrix, giving the organism flexibility and mobility while maintaining its structural foundation.

Collagen fibers and amoeboid cells are also present in this gelatinous substance, which supports the cnidarian

body structure's general foundation and strength.

3) What are the two body forms of cnidarians and make a sketch of each below.

The polyp and the medusa are the two unique body types seen in cnidarians. Typically cylindrical or vase-

shaped, polyps have a mouth encircled by tentacles at one end and are sessile organisms that are frequently

connected to a substrate. Medusae, on the other hand, have a mouth on the bottom of the bell and tentacles

that extend from the rim, giving them a bell-like or umbrella-like appearance. Medusae are more mobile than

polyps and may swim freely. Cnidarians may adapt to a variety of biological niches and lifestyles in marine

environments because to these two body shapes.

GROUP 8

BS BIO 1C

05/03/2024

Nina Anrish Joy G. Tadia

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Cnidarian worksheet: Name: ______________________________ Section: ____________ Date: ____________ Cnidarian Guide Questions:

What unique characteristics do cnidarians have? There are several distinctive features that set cnidarians apart. They are able to understand inputs from all directions because they have radial symmetry, a characteristic not found in other animals. Nematocysts, which are utilized by cnidarians for defense and prey capture, are found in specialized cells known as cnidocytes. They usually have a core gastrovascular chamber surrounded by two layers of tissue that serve both circulatory and digestive purposes. For fundamental coordination, cnidarians have a decentralized nerve net, unlike higher animals with centralized neural systems. Furthermore, a great deal of cnidarians display unique polyp and medusa body shapes during their life cycle, which further increases their capacity to adapt to a wide range of aquatic conditions. Together, these characteristics make cnidarians distinct and productive marine environment occupants.
Name the tissue layers that cnidarians have. Describe the material that is between these tissues? The inner gastrodermis and the outer epidermis are the two main tissue layers found in cnidarians. The animal's epidermis makes up its outer layer, while the gastrodermis lines the inside of the gastrovascular cavity. The gelatinous material known as mesoglea is located in between these two layers. Mesoglea acts as a supporting matrix, giving the organism flexibility and mobility while maintaining its structural foundation. Collagen fibers and amoeboid cells are also present in this gelatinous substance, which supports the cnidarian body structure's general foundation and strength.
What are the two body forms of cnidarians and make a sketch of each below. The polyp and the medusa are the two unique body types seen in cnidarians. Typically cylindrical or vase- shaped, polyps have a mouth encircled by tentacles at one end and are sessile organisms that are frequently connected to a substrate. Medusae, on the other hand, have a mouth on the bottom of the bell and tentacles that extend from the rim, giving them a bell-like or umbrella-like appearance. Medusae are more mobile than polyps and may swim freely. Cnidarians may adapt to a variety of biological niches and lifestyles in marine environments because to these two body shapes.

Differentiate cnidocytes and nematocysts? Although they are homologous structures in cnidarians, nematocysts and cnidocytes have different purposes. Specialized cells known as cnidocytes are found in the cnidarian epidermis and contain a variety of organelles known as cnidae. Nematocysts are specific types of cnidae that are present in cnidocytes and are in charge of giving poisons to predators or prey. Cnidocytes release nematocysts, which resemble harpoons and may pierce a target with venom, when they are aroused. Although cnidocytes are a more general kind of cell, nematocysts are a particular kind of organelle found in cnidocytes that is involved in defense and prey acquisition.
Give three types of cnidae. The nematocyst, spirocyst, and ptychocyst are the three forms of cnidae that are present in cnidarians. The most common and widespread kind, nematocysts, are in charge of transferring poisons to either prey or predators. The main function of spirocysts, which resemble thread-like structures, is to ensnare and capture prey. Though they are less prevalent, ptychocysts help some species of cnidarians produce protective structures like tubes or spines. Every kind of cnidae has a distinct function in defensive, predatory, or structural support, which helps cnidarians survive and adapt to a variety of marine settings.
What is the role of nematocyst? Cnidarians possess a unique structure called a nematocyst, which is mostly used as a defense and predatory mechanism. Nematocysts quickly discharge and release a coiled, barbed thread in response to chemical or physical stimuli, such as contact with prey or possible dangers. The target is shot with this thread, which injects venom into it, causing it to be immobilized or lethal. Nematocysts are an essential component of cnidarians' survival and ecological success in marine settings because they help them catch prey, fight off predators, and protect themselves from any dangers.
How many body openings do cnidarians have? Why is it called a blind digestive tube? Typically, a cnidarian's single body entrance functions as its mouth and anus, leading to the gastrovascular cavity, which is the digestive system's core cavity. This arrangement is commonly known as a "blind digestive tube" due to the fact that waste and food pass through the same opening. Food is broken down by enzymes released by the gastrodermal cells in the gastrovascular cavity after it is swallowed. While undigested materials is ejected by the mouth, nutrients are immediately absorbed into the cells lining the cavity. Its anus is absent from this basic digestive system, which is why it is called "blind," as waste products have no clear way out.
What is the effect of the poison produced by cnidarians on their prey? When a cnidarian's nematocyst comes into touch with its prey, it releases a toxin that causes an array of reactions in it. Nematocysts inject venom with the intention of immobilizing or killing their target so that the cnidarian may more easily capture and consume it. By disrupting the nerve system of the victim, the toxin may cause paralysis and cause the victim to stop moving. Furthermore, the venom has the ability to trigger necrosis or tissue damage, which helps break down the prey's body for digesting. Certain cnidarians also expel

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