What is true of osmoconforming organisms? Check all that apply. Check All That A
ID: 178402 • Letter: W
Question
What is true of osmoconforming organisms? Check all that apply.
Check All That Apply
Osmoconformers have a very low tendency to gain or lose water by osmosis across the skin or gills.
Osmoconformers expend more energy compared to their osmoregulating counterparts to compensate for water loss.
Vertebrate osmoconformers have a high concentration of uncharged molecules in their extracellular fluid.
Vertebrate osmoconformers can tolerate a high ion concentration in their body fluids better than osmoregulators.
Explanation / Answer
Osmoconformers have a very low tendency to gain or lose water by osmosis across the skin or gills.
True : Internally the osmoconformers are isosmotic to their external environment. Thus minum influx and efflux of water in and out of cells is required.
Osmoconformers expend more energy compared to their osmoregulating counterparts to compensate for water loss.
False :Osmoconformers do not expend more energy compared to their osmoregulating counterparts as they accumulate urea in their body so that isotonic environment can be build, however osmoregulators have to spend much of energy in maintaining osmotic balance by exchange of water and ions in and out of cells.
Vertebrate osmoconformers have a high concentration of uncharged molecules in their extracellular fluid.
True: Vertebrate osmoconformers have high concentration of urea and trimethylamine oxide (TMAO) to neutralise toxic effect of urea in their extracellular fluid. Urea is an uncharge molecule.
Vertebrate osmoconformers can tolerate a high ion concentration in their body fluids better than osmoregulators.
False: As they retain urea in their body fluid to maintain osmotic equilibrium amongst their internal and external environment, they are stenohaline hence they cannot tolerate high ion concentration as compared to osmoregulators.
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