movement of substances into and out of cells

Question 1

Define diffusion

Answer 1

Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration . Diffusion occurs in liquids and gases when their particles collide randomly and spread out. It’s a passive process meaning it doesn’t require energy.

Question 2

Define Osmosis

Answer 2

Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell’s partially permeable membrane. It’s a passive process meaning it doesn’t require energy.

Question 3

Define Active Transport

Answer 3

Active Transport is the movement of ions or molecules across a cell membrane into a region of higher concentration, requiring energy.

Question 4

Name 4 factors that affect diffusion

Answer 4

The concentration gradient, temperature, surface area to volume ratio and distance that particles must travel.

Question 5

Diffusion is faster when…

Answer 5

There is a larger concentration gradient, higher temperature, large surface area to volume ratio and a shorter distance.

Question 6

Why is diffusion important?

Answer 6

Diffusion help cells receive raw materials for respiration, remove waste products and plants use of photosynthesis.

Question 7

Name 5 factors that affect osmosis

Answer 7

Pressure, temperature, concentration gradient, surface area, and water potential

Question 8

Osmosis is faster when…

Answer 8

Higher temperature, the lower the concentration of the solute and more permeable membrane