B1.3 transport in cells

Question 1

is active transport passive?

Answer 1

no, it needs energy

Question 2

what does a partially permeable membrane mean

Answer 2

it will absorb only some molecules

Question 3

is osmosis passive

Answer 3

yes, it does not require energy

Question 4

what factors affect diffusion

Answer 4

concentration
Temperature
surface area

Question 5

is diffusion passive
(no energy required?)

Answer 5

yes, it does not need energy
high ——–> low concentration

Question 6

what is active transport

Answer 6

the movement of substances against a concentration gradient (requires energy)

Question 7

what is Osmosis

Answer 7

diffusion with water, the net movement of water through a partially permeable membrane, into a solution with a lower water concentration

Question 8

why do root hair cells have large surfaces?

Answer 8

to get more water(through osmosis)
and more minerals (through active transport), so lots of mitochondria are needed

Question 9

what is Diffusion

Answer 9

the net movement of particles from an area of high concentration to an are of low concentration

Question 10

what is a concentration gradient?

Answer 10

a change in the concentration of a substance from one region to another