Amoeba Sisters: Osmosis

What is the primary reason for salting roads during winter?

• To increase the freezing point of water

• To lower the freezing point of water and prevent icing

• To make the roads look white

• To harm roadside plants

What is the effect of salty ocean water on plants during hurricanes?

• It turns the plants into salt-tolerant species

• It can eventually kill the plants

• It makes them grow faster

• It has no effect

What does osmosis involve?

• The movement of salt molecules through a membrane

• The active transport of water requiring energy

• The movement of water through a semi-permeable membrane

• The movement of water from lower to higher water concentration

What happens to water molecules during osmosis?

• They move from areas of high water concentration to low water concentration

• They are completely stopped by the cell membrane

• They require energy to move across the membrane

• They move from areas of low solute concentration to high solute concentration

What is the result when you add a large amount of salt to one side of a U-tube?

• Water moves to the side with more salt to dilute it

• Water moves to the side with less salt

• Salt moves to the side with more water

• Water level remains the same on both sides

What does hypertonic mean?

• Higher solute concentration

• Equal solute concentration

• No solute concentration

• Lower solute concentration

Why can't pure water be used in an IV?

• It would have no effect on cells

• It is too expensive to produce

• It would cause cells to swell and possibly burst

• It would cause cells to shrink

Why can't saltwater fish live in freshwater tanks?

• Because they need salt to swim

• Because the water temperature is different

• Because the water would move into their cells and could kill them

• Because they are allergic to freshwater

What is turgor pressure?

• The pressure exerted by water inside animal cells

• The pressure needed to stop osmosis

• The pressure exerted by water inside plant cells against the cell wall

• The pressure plants apply to absorb water from the soil

What is the significance of water potential in osmosis?

• It measures the amount of water in a cell

• It determines the direction of water movement based on solute and pressure potential

• It is irrelevant to the process of osmosis

• It determines the direction of active transport