Grade 8 SRM -2

What is diffusion?

• The movement of particles from an area of low concentration to an area of high concentration.

• The movement of particles from an area of high concentration to an area of even higher concentration.

• The movement of particles from an area of low concentration to an area of even lower concentration.

• The movement of particles from an area of high concentration to an area of low concentration.

Explain the concept of selective permeability.

• Selective permeability is the property of a membrane to only allow large molecules to pass through while restricting the passage of small molecules.

• Selective permeability is the property of a membrane to only allow gases to pass through while restricting the passage of liquids.

• Selective permeability is the property of a membrane to allow all substances to pass through without any restriction.

• Selective permeability is the property of a membrane to only allow certain substances to pass through while restricting the passage of others.

Define hypertonic solution and provide an example.

• An example of a hypertonic solution is distilled water.

• A hypertonic solution has a lower solute concentration than the cell.

• An example of a hypertonic solution is a 10% salt solution.

• A hypertonic solution causes a cell to swell.

What happens to a cell in a hypotonic solution?

• It remains the same size

• It shrinks and becomes dehydrated

• It swells and may burst

• It multiplies and forms a colony

Describe an isotonic solution and its effect on cells.

• An isotonic solution has a higher concentration of solutes than the cell, causing water to rush into the cell and burst.

• An isotonic solution has no effect on cells and does not impact the movement of water.

• An isotonic solution has the same concentration of solutes as the cell, causing no net movement of water in or out of the cell.

• An isotonic solution has a lower concentration of solutes than the cell, causing water to rush out of the cell and shrink.

Differentiate between facilitated diffusion and active transport.

• Facilitated diffusion is passive, while active transport is active.

• Facilitated diffusion involves the use of transport proteins, while active transport does not.

• Facilitated diffusion moves molecules against the concentration gradient, while active transport moves molecules with the concentration gradient.

• Facilitated diffusion requires energy, while active transport does not.

How does osmosis differ from diffusion?

• Osmosis involves the movement of water molecules, while diffusion involves the movement of particles.

• Osmosis and diffusion are the same process.

• Osmosis only occurs in plants, while diffusion only occurs in animals.

• Osmosis involves the movement of particles, while diffusion involves the movement of water molecules.

Explain the process of osmosis in plant cells.

• Water molecules move from an area of high concentration to an area of low concentration through a selectively permeable membrane.

• Osmosis is the movement of nutrients from the soil into the plant cells.

• Water molecules move from an area of low concentration to an area of high concentration through a selectively permeable membrane.

• Osmosis only occurs in animal cells, not in plant cells.

What role does the cell membrane play in osmosis?

• Has no effect on osmosis

• Regulates the movement of water and solutes

• Prevents the movement of water and solutes

• Causes the cell to shrink

Discuss the importance of osmosis in living organisms.

• Osmosis is only important for the movement of gases across cell membranes

• Osmosis has no importance in living organisms

• Osmosis is important for the movement of water and nutrients across cell membranes.

• Osmosis only occurs in non-living matter