1. Passive and Active Transport
National 4/5 biology
Passive and Active Transport

2. Recap
Cell B is
A. turgid
B. plasmolysed
C. Placed in pure water

3. Which solution is hypotonic?A B

4. What best describes the state of the red blood cell?
Turgid
Burst
Plasmolysed
No change

5. What best describes the state of the plant cell?
Placed in concentrated salty water
Placed in concentrated sugar solution
Placed in pure water
Placed in slightly salty water

6. What best describes a concentration gradient?
A. a high concentration on one side of a membrane and a high concentration on the other side of the membrane
B. a low concentration on one side of a membrane and a low concentration on the other side of the membrane
C. a high concentration on one side of the membrane and a low concentration on the other side of the membrane

7. We are learning to:
Explain the difference between active and passive transport
Explain the term concentration gradient
Name examples of passive transport

8. What’s the difference between active and passive transport?
Passive occurs without energy
Active requires energy

9. Passive Transport
Which of the following do you think are passive forms of transport
Diffusion
Osmosis
Active transport
That was easy!!!
Passive transport occurs with the concentration gradient from a high to a low concentration

10. Passive transport Passive transport does not require energy to occur
Small molecules can pass across the cell membrane very easily
E.g. water, oxygen, carbon dioxide, amino acids and glucose

11. Active Transport
Active transport requires energy for membrane proteins to move molecules against the concentration gradient in order to maintain the gradient