a) Based on the figure above, name the three organisms (or groups of organisms)

Question

a) Based on the figure above, name the three organisms (or groups of organisms) that show most osmotic conformity to their environment.      

b) Name the three invertebrates that show a strong ability to osmoregulate over a wide osmotic range, i.e., invertebrates that are euryhaline.   

c) Based on the figure above, name a stenohaline invertebrate.

Examptes Marine invertebrates and elasmobranchs Sea water Estuarine crab 1000 Terrestrial insects and vertebrates Estuarine annelid Estuarine prawn Most marine vertebrates 500 Freshwater shrimp Brine pool mosquito larva Freshwater eel 500 1000 Sea water Osmolarity of environment imOsm)

Explanation / Answer

Osmoconformors are those organisms whose internal environment is isotonic with that of the external environment. Marine invertebrates, elasmobrachns, and estuarine annelids are osmoconformors

Osmoregulatory organisms need to regulate their osmotic pressure by regularly excreting water or ions. They spend energy to maintain osmotic stability. Fresh water shrimp, terrestrial insects and vertebrates are osmoregulatory in nature

Stenohaline organisms can withstand only narrow ranges of osmotic pressures and can’t withstand fluctuations. Estuarine prawn and marine vertebrates are stenohaline. Estuarine prawn are the invertebrate stenohaline organisms.

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