B1- transport in cells

Question 1

what is diffusion?

Answer 1

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

Question 2

what can the rate of diffusion be affected by?

Answer 2

• concentration gradient
• the temperature
• the surface area of the cell

Question 3

what is osmosis?

Answer 3

the diffusion of water molecules, from a region where the water molecules are in higher concentration, to a region where they are in lower concentration, through a partially permeable membrane.

Question 4

what is active transport?

Answer 4

substances moving against the concentration gradient

Question 5

how is active transport used in plants?

Answer 5

For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. Active transport then occurs across the root so that the plant takes in the ions it needs from the soil around it.

Question 6

does diffusion require energy?

Answer 6

no

Question 7

does osmosis require energy?

Answer 7

no

Question 8

does active transport require energy?

Answer 8

yes