Much of the behaviour of water in living organisms is determined by the osmolarity of fluids within those organisms.Â
Define osmolarity
State the name of the structures which insects use to concentrate and excrete nitrogenous waste.
The image below shows two compounds, A and B involved in the excretion of nitrogenous waste from animals.
Identify A and B.
The image below represents part of a marine ecosystem and two of its inhabitants, a jellyfish and a lobster. Both animals have recently entered this part of the ecosystem from another area of the ocean.Â
The numbers represent the osmolarity of the cell contents of the organisms and that of the surrounding sea water, in arbitrary units.Â
Predict and explain the level of osmolarity of the jellyfish's cell contents after a period of time in this part of the ecosystem.Â
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