B1b- transport in cells

Question 1

What is diffusion?

Answer 1

The spreading out of particles in a solution/gas
high concentration -> low concentration

Question 2

What is osmosis?

Answer 2

The diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane

Question 3

What is active transport?

Answer 3

Movement of substances from a more dilute solution to a more concentrated solution against a concentration gradient.

Question 4

How are small intestines adapted for cell transport? (3)

Answer 4

villi- increase surface area
villus- thin membrane to allow a short diffusion
each villus has a good blood supply

Question 5

How are the lungs adapted for cell transportation? (4)

Answer 5

Alveoli- increase surface area in the lungs
Alveoli have a thin membrane to allow a short diffusion path
Each alveolus has a good blood supply
Good ventilation in animals for gas exchange

Question 6

How are gills in fish adapted for cell transportation? (4)

Answer 6

Gill filaments increase surface area in gills
Gills have a thin membrane for a short diffusion path
Each gill has a good blood supply
Good ventillation in animals for gas exhange- flow of oxygen rich water through the mouth and out the gills

Question 7

How are roots adapted for cell transportation? (2)

Answer 7

Root hair cells increase surface area in the roots
Root hair cells have a thin membrane which allows for a short diffusion path

Question 8

How are leaves adapted for cell transportation? (2)

Answer 8

Leaves have a large surface area
Leaves are very thin and therefore allow for a short diffusion path