Aim What is Osmosis?

Water Water can readily pass through a cell membrane even though many other particles can not.

Semi -permeable When a membrane allows some particles to pass across them but others cannot Selective permeable

Osmosis The diffusion of water through a semi- permeable membrane

Water equilibrium For organisms to survive they must balance the intake and loss of water

Water will move across a membrane towards salt or sugar Movement of Water Water will move across a membrane towards salt or sugar Salt sucks

Isotonic When the concentration water is equal inside and outside of cell Equilibrium is reached

Plant Cells In contact with fresh water Water moves in Rigid cell walls prevent it from expanding or bursting

Bacteria in Fresh Water Water will tend to move into cell Uses ATP energy in active transport to pump water out

An investigation was set up to study the movement of water through a membrane. The results are shown in the diagram below. Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a water solution in which the salt concentration is much higher than the salt concentration in the red blood cells? The red blood cells will absorb water and increase in size. The red blood cells will lose water and decrease in size. The red blood cells will first absorb water, then lose water and maintain their normal size. The red blood cells will first lose water, then absorb water, and finally double in size

A red onion cell has undergone a change, as represented in the diagram below. This change is most likely due to the cell being placed in distilled water light salt water darkness

The diagram below represents a plant cell in tap water as seen with a compound light microscope Which diagram best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?