Diffusion/Osmosis

Where is there a high concentration of water in a plant?

• In the leaves, where photosynthesis occurs.

• In the roots, where water is absorbed.

• In the vase, where the water is stored.

• In the flowers, where nectar is produced.

What is required for active transport?

• Energy is required to move molecules against their concentration gradient.

• Passive diffusion of molecules along their concentration gradient.

• Facilitated diffusion through protein channels.

• Osmosis of water molecules across a membrane.

What is a concentration gradient?

• A concentration gradient is the difference in the concentration of a substance between two areas.

• A concentration gradient is the uniform distribution of a substance in a single area.

• A concentration gradient is the process of mixing two substances together.

• A concentration gradient is the measurement of temperature differences in a solution.

What is osmosis?

• The movement of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

• The process of diffusion of solutes across a membrane.

• The movement of water molecules from an area of high solute concentration to an area of low solute concentration.

• The absorption of nutrients by plant roots from the soil.

Why is energy important in active transport?

• It allows cells to move substances against their concentration gradient, which is essential for maintaining homeostasis.

• It helps in the passive diffusion of substances across the cell membrane.

• It is used to break down waste products in the cell.

• It provides energy for cellular respiration processes.

What is the main difference between osmosis and diffusion?

• Osmosis refers to the movement of any type of molecule, while diffusion specifically refers to the movement of water.

• Osmosis specifically refers to the movement of water, while diffusion refers to the movement of any type of molecule.

• Osmosis and diffusion are the same process with no differences.

• Osmosis occurs only in living cells, while diffusion can occur in non-living systems.

What happens to a cell in a hypotonic solution?

• Water moves out of the cell, causing it to shrink.

• Water moves into the cell, causing it to swell and potentially burst.

• The cell remains unchanged in size and shape.

• The cell becomes more rigid and less permeable.

What type of molecules typically require active transport?

• Small nonpolar molecules that easily pass through the cell membrane.

• Large molecules or ions that cannot easily pass through the cell membrane.

• Water molecules that diffuse freely across the membrane.

• Gases like oxygen and carbon dioxide that move through simple diffusion.

What is the difference between passive and active transport?

• Passive transport requires energy to move molecules against their concentration gradient, while active transport does not require energy and moves molecules down their concentration gradient.

• Passive transport moves molecules against their concentration gradient without energy, while active transport moves molecules down their concentration gradient with energy.

• Passive transport does not require energy and moves molecules down their concentration gradient, while active transport requires energy to move molecules against their concentration gradient.

• Passive transport and active transport are the same processes that do not involve energy.

How does temperature affect the rate of diffusion?

• Higher temperatures decrease the kinetic energy of molecules, leading to a slower rate of diffusion.

• Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.

• Temperature has no effect on the rate of diffusion.

• Lower temperatures increase the rate of diffusion.