Jellyfish: Plant or animal?

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autumn
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Jellyfish: Plant or animal?

Post by autumn » Sun Apr 30, 2006 4:07 pm

I'm kind of confused with this question:

When a jellyfish is removed from its saltwater environment and put into fresh water it swells and bursts. Do you think a jellyfish is a plant or an animal? Why? [Hint: think about how plant cells and animal cells react when placed in a solution.]

Help?

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Post by alextemplet » Sun Apr 30, 2006 4:58 pm

It's an animal, part of the phylum cnideria.
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Khaiy
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Post by Khaiy » Mon May 01, 2006 2:49 am

The hint talks about cells being hypertonic or hypotonic to their solutions. But think about this: Animal cells have cell membranes, plant cells have cell walls... what do you know about those?

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Post by kabuto » Mon May 01, 2006 3:33 am

When a jellyfish is removed from its saltwater environment and put into fresh water it swells and bursts


i hv a question.
would the entire jellyfish burst or just the cells in it?
will the same thing happen to human if we were put in a solution hypotonic enough since we also have no cell wall?

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Poison
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Post by Poison » Mon May 01, 2006 5:28 pm

Your cells can burst if they are put in hypotonic solution.
You do not burst but you gain water in fresh water. Think about people killed and thrown in rivers. They get lots of water and become very heavy.

PS: No need to "think" about jellyfish, it is an animal. :)
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Post by AstusAleator » Tue May 02, 2006 1:48 am

Your epidermis is pretty tough, and resistant to hyper-osmosis. However, if one was to inject pure H20 into your bloodstream, it would cause your erythrocytes to burst. Furthermore (I think this has been discussed on this forum) if you were to drink an ungodly amount of water, it could do damage to your internal orgrans (though epithelial tissue is resistant to that in general)
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Post by kabuto » Tue May 02, 2006 2:05 am

how about the jellyfish? :roll:

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Post by MrMistery » Tue May 02, 2006 8:11 pm

the cells of the jellyfish would burst..
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Post by kabuto » Wed May 03, 2006 12:54 pm

MrMistery wrote:the cells of the jellyfish would burst..


thank you for clarifying..
so, there wont be any dramatic scene here

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Post by MrMistery » Wed May 03, 2006 5:16 pm

only the death of the animal :D
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Post by cool A-level student » Mon May 08, 2006 12:57 pm

some of our cells do burst if the water potential is strange in the blood, for instance if the plasma has a pO2 of -20 and a red blood cell has -10 then the water will leave the cell and it will shrivel as it travels along the concentration gradient
also if the pO2 was reversed i.e. cell -20 and plasma -10 then water will be taken up by the cell and it would burst

although generally the the blood is about the same water potential inside and outside of the cells to prevent such things from happening, so make sure no one puts H2o in ur blood and u'll pretty much be fine

as for the jellyfish no thought is needed as its definately a animal, it does everything an animal does, most of all it moves and hve u ever seen a plant move? other than from wind and fungus flytraps no

sry if i blabbered on abit lol

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Jellyfish is a...

Post by D » Mon May 08, 2006 1:54 pm

i think jellyfish are gay

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