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Why does a jellyfish have stinging tentacles hanging beneath its body?
Wiki User
∙ 14y ago
there are two reasons for this.
1. to capture and stun food
2. to scare away predators
Wiki User
∙ 14y ago
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What is the body form of a jellyfish?
Medusa body form. Medusa-Umbrella shaped, tentacles hanging down. Swim about.
Do jellyfish put their food in their mouth or drop it in their mouth?
Since jellyfish float in the water with their tentacles hanging down, you would say they put food into their mouth.
How would a jellyfish catch a fish?
jellyfish have tentacles hanging down and streaming behind them in the ocean that have poisonous stingers on them, and other tentacles that grasp prey that has been stung and pulls it up into itself.
What is the Phylum Classification and Dichotomous Key for a jellyfish?
Phylum: Cnidaria Dichotomous key: Does the organism have a bell-shaped body? (Yes - Proceed to 2, No - Not a jellyfish) Does the organism have tentacles hanging down? (Yes - Likely a jellyfish, No - Not a jellyfish)
What is the diffence between polyp and Medusa?
polyp---sea anenome, medusa---jellyfish Phlycabs In plain English a polyp is a cylinder with tentacles at the top. The Hydra looks like a tin can with slender arms coming from the top of its body. This body form does not move and the animals are trappers. The medusa is an umbrella shaped structure with tentacles hanging down from it. The jellyfish is an example. These animals move. During the reproductive stages of the jellyfish there is a time when they take on the polyp form. Then they bud off and become medusa. Nighthawk
A is the sexual form of a cnidarin that has a body form like an umbrella with tentacles hanging down?
medusa
What are two body forms in the phylum cnidarian?
The two body forms in the phylum Cnidarian are the polyp and medusa. Polyps are usually stationary, with a cylindrical body and tentacles surrounding a central mouth. Medusas are free-swimming and have a bell-shaped body with tentacles hanging down.
What does the Physalia jellyfish look like?
it has like a blue bubble on top and it has blue stingers hanging from it..
A mass is hanging from a spring what forces are acting on the mass?
I do believe that it is either kinetic or potential energy. From jellyfish
Where does the lion's mane jellyfish live?
The lion's mane jellyfish is the largest known jellyfish, varying in size but averaging 5-6 feet in diameter across the bell and tentacles over 100 inches. Toxin in the sting generally causes burning, localized pain, It is treated with vinegar, rubbing alcohol, and even urine. Human contact is not common, as this species rarely ranges fifths south than 42 degrees north latitude.
Can you hang a bag on a malibox or post?
You cannot hang anything on any part of the mailbox itself. Hanging items from the post beneath it is allowed.
How a jellyfish looks like?
Jellyfish have two major body forms throughout their life. The first form is called the polyp stage and is characterized by either a non-moving (sessile) stalk that catches food drifting by or a similar form that is free-floating. Their mouth and tentacles are located anteriorly, facing upwards. The second form looks like a saucer and is called the medusa stage. It is characterized by a round (radially symmetric) dome-shape body plan with food-catching tentacles hanging down. It is this form which is most able to respond to and interact with its environment and is also the form with which people are most familiar. Some jellyfish don't have a stalked stage. With few exceptions, jellies are dioecious, which means that each animal is either male or female. A group of animals releases sperm and eggs which may mix in the water column and become fertilized or, in the case of the moon jelly (Aurelia), the eggs become lodged in pits on the oral arms, which form a temporary brood chamber where fertilization takes place. After fertilization and initial growth, a larval form, called a planula, develops from the egg. The planula larva is small, and is covered with cilia, similar in appearance to a tiny hairy football. The planula larva settles onto a firm surface, and changes into a polyp. The polyp resembles a tiny sea anemone- cup-shaped with tentacles surrounding a single opening. Once the polyp begins reproducing asexually by budding, it's called a segmenting polyp, or a scyphistoma. New scyphistomae may be produced by budding or new, immature jellies called ephyra may be formed. These young jellies swim off and grow up into adults. Many jellyfish can bud off new medusae directly from the medusan stage also. Like all other cnidarians, jellyfish have stinging cells called cnidocytes which contains the stinging nematocysts on their tentacles. Whenever a prey comes in contact with a tentacle, hundreds to thousands of nematocysts fire one or another type of "hook and line" into the prey. These stinging cells are thus able to latch onto the prey and the tentacles bring the prey item into their large "mouth" for digestion.These cells are activated by a simple but precise nervous system called a nerve net which is located in the epidermis of the jellyfish. Impulses to these nerve cells are sent from the nerve rings that have collected information from the environment of the jellyfish through the rhopalial lappet, which is located around the animal's body. Jellyfish also have "eyes" or ocelli that cannot form images, but are sensitive to light. Jellyfish do not have a specialized digestive system, osmoregulatory system, central nervous system, respiratory system, or circulatory system. They are able to digest with the help of the gastrodermis that lines the gastrovascular cavity, where nutrients from their food is absorbed. They do not need a respiratory system since their skin is thin enough that oxygen can easily diffuse in and out of their bodies. Jellyfish move using a hydrostatic skeleton that controls the water pouch in their body to manipulate their movements. Most jellyfish are not dangerous to humans but a few are highly toxic, such as the Cyanea capillata. Contrary to popular belief, the menacingly infamous Portuguese Man o' War (Physalia) isn't actually a jellyfish, but a colony of hydrozoan polyps. Many aquaria, such as Monterey Bay Aquarium, Vancouver Aquarium, and Maui Ocean Center, feature jellyfishes in display. Often the tank's background is blue with the animals illuminated by side lighting to produce a high contrast effect. In natural conditions, many of the jellies are so transparent that they can be almost impossible to see. A group of jellyfish is often called a 'smack'. Many species of jellyfish can congregate into large swarms or 'blooms'. The formation of these blooms is a complex process that depends on ocean currents, nutrients, temperature and oxygen content.
