Which jellyfish is the odd one out

Observe the diagram showing the characteristics of a phylum. Score 3. Note the relationship in the first pair and then complete the second pair.

Score 1. Arrange the following terms under two headings based on symmetry Score 1 Arthropods. Ctenophores, Molluscs, Coelenterates. But some of the examples are wrongly given. Identify and rearrange it. Rat, Frog, Dog fish, Ostrich. Class 7.

Class 8. Class 9. Class Popular Books. Download PDFs. Quick Revision Notes. Mind Maps. Sample Question Papers. They can grow to the size of dustbin lids - giving them their other common name: dustbin-lid jellyfish! They are attracted inshore by plankton blooms which provide a plentiful supply of food. They have 8 arms, each frilly in appearance. These frills actually contain their small stinging tentacles which surround hundreds of little mouths!

The sting of the barrel jellyfish is not normally harmful to humans, though if you find one on the beach it's best not to handle it as they can still sting when dead.

How to identify A large translucent jellyfish with a huge mushroom shaped bell and a bunch of 8 frilly tentacles below. They don't have marginal tentacles, but do have a violet fringe around the bell which contains sense organs.

They are often found washed up on beaches in May and June. Jellyfish swarms could entice more marine life The leatherback turtle and the oceanic sunfish have been known to visit Dorset. Identify your jellyfish sighting See Dorset's jellyfish on this downloadable guide. While corals, oysters, and any marine organisms that build shells are considered the biggest losers of increasingly acidic oceans, jellyfish aren't as susceptible. That doesn't mean they are immune, but they are certainly faring better.

One look at a jellyfish and this might seem rather obvious, but they aren't actually fish. They are invertebrates from the phylum Cnidaria , and are so varied as a taxonomic group that many scientists have taken to simply referring to them as " gelatinous zooplankton. When they wash ashore, they can disappear after just a few hours as their bodies evaporate into the air. They have a rudimentary nervous system, a loose network of nerves located in the epidermis called a "nerve net," but no brain.

They also don't have a heart; their gelatinous bodies are so thin they can be oxygenated solely by diffusion. Despite their simple body design, some jellyfish have the ability to see. In fact, for a few species their vision can be surprisingly complex. For instance, the box jellyfish has 24 "eyes," two of which are capable of seeing in color.

It's also believed this animal's complicated array of visual sensors makes it one of the few creatures in the world to have a full degree view of its environment. At least one species of jellyfish, Turritopsis nutricula , may be able to cheat death. When threatened, this species is capable of undergoing "cellular transdifferentiation," a process whereby the organism's cells essentially become new again. In other words, this jellyfish has a built-in fountain of youth. It's theoretically immortal!

It might not sound very appetizing, but jellyfish have no need for separate orifices for eating and pooping. They have one orifice that does the job of both the mouth and the anus. But that's also beautiful in a minimalist sort of way.