osmosis practical

A learner was trying to find the water potential of potato cells. The results show that when potato chips were left in a solution with a concentration of 0.3M, there was no change in mass of the potato. What is the ψ of the potato cells?

Which cell is placed into a hypotonic environment? 

• A
• B
• C
• D

Osmosis

• diffusion of water molecules through a semi-permeable mebrane from an area of low concentration to an area of high concentration
• the diffusion of particles from an area of high concentration to an area of low concentration
• diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration
• the diffusion of particles from an area of low concentration to an area of high concentration

The diagram shows an experiment to demonstrate the movement of molecules.

After one hour, the water in the beaker turned red.

What is the most likely reason for this colour change?

• Molecules of red ink move through the membrane by diffusion

• Molecules of red ink move through the membrane by osmosis.

• Molecules of water move through the membrane by diffusion.

• Molecules of water move through the membrane by osmosis

Red blood cells were placed in a dilute solution.

Movement of water across the cell membrane caused a change in their appearance.

What explains this movement?

• A

• B

• C

• D

A jar of air was placed upside down on top of a jar containing a brown gas as shown.

Which process has taken place?

• diffusion both upwards and downwards

• diffusion downwards only

• diffusion upwards only

• diffusion and osmosis

What type of transport is this?

• facilitated diffusion
• active transport
• diffusion
• osmosis

In which direction will these molecules diffuse?

• from right to left
• from left to right
• they will not move at all
• they will move in both directions equally

What type of cellular transport uses energy?

• Passive Transport
• Active Transport

In the cell pictured, which way would water move?

• Into the cell, causing the cell to swell

• Out of the cell, causing the cell to shrink

• In and out of the cell equally, keeping the shape the same