Topic3 Transport In And Out Of Cells

Question 1

What is diffusion?

Answer 1

Random net movement of particles from a high concentration to an area of lower concentration gradient

Question 2

What are the adaptations in leafs for diffusion?

Answer 2

Air spaces (maintains a higher concentration gradient), stomata helps provide a larger surface area, flat thin leaves (for shorter diffusion pathway)

Question 3

What are the adaptations in fish gills for diffusion?

Answer 3

Many filaments (produces a larger surface area), thin filament walls (for short diffusion pathway ). Gills have a rich blood supply (maintains a higher concentration gradient)

Question 4

What is active transport?

Answer 4

The movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration. A carrier protein is needed.

Question 5

What is osmosis?

Answer 5

Net movement of water from an area of higher water concentration to an area of low water concentration, through a partially permable membrane.

Question 6

What factors determine the speed of diffusion?

Answer 6

Temperature (moves particles faster), higher concentration gradient, larger surface area, short diffusion pathway.

Question 7

How are the lungs adapted for diffusion?

Answer 7

Have a rich blood supply( maintains a higher concentration gradient), walls of the alveoli are very thin ( short diffusion pathway.), many alveoli (provides larger surface area for gas exchange).

Question 8

What does permeable membrane mean?

Answer 8

A membrane that lets some things through it e.g cell membrane