Transporting Substances

Question 1

What is diffusion?

Answer 1

Movement from an area of high concentration to and area of low concentration until an equilibrium is found

Question 2

What is osmosis?

Answer 2

The diffusion of water molecules through a partially permeable membrane

Question 3

What is active transport?

Answer 3

Movement from an area of low concentration to an area of high concentration, against the concentration gradient so this requires energy

Question 4

What would happen to the mass of a potato if in a higher concentration sugar solution?

Answer 4

• There is a lower concentration of water outside the potato
• Therefore water moves out of the potato by osmosis
• Causing a decrease in mass

Question 5

What is a concentration gradient?

Answer 5

The difference in the concentration of a chemical across a membrane

Question 6

How can the concentration gradient affect the rate of diffusion?

Answer 6

The greater the difference in concentration, the quicker the rate of diffusion

Question 7

What would happen to the mass of a potato if in a lower concentration sugar solution?

Answer 7

• There is a higher concentration of water outside the potato
• Therefore water moves into the potato by osmosis
• Causing an increase in mass