Movement In And Out Of Cells

Question 1

Diffusion

Answer 1

Diffusion is the net movement of molecules and ions, from a region of higher concentration m to a region of lower concentration down a concentration gradient

Question 2

What favours diffusion

Answer 2

Large surface areas

Question 3

What is diffusion useful for

Answer 3

Smaller molecules ( sugar grains will diffuse faster than sugar cubes)

Shorter distances

Stronger concentration gradient, warmer temperatures

Question 4

Diffusion formula

Answer 4

Distance /time

Question 5

Examples of diffusion

Answer 5

• oxygen moved into a organisms body via diffusion

- carbon dioxide is removed through diffusion

Question 6

Increase %

Answer 6

New length/original length x 100

Question 7

Osmosis

Answer 7

A specific case of diffusion for water molecules (requires a partially permeable membrane)

Question 8

Turgid

Answer 8

• water enters

- vacuole swells and pushes against cell wall

Question 9

Flaccid cell

Answer 9

• water lost from cell
• vacuole shrinks
• cell loses shape

Question 10

Active transport

Answer 10

Active transport is a method by which molecules and particles can cross membrane against a concentration gradient.