Movement of molecules

Question 1

What is turgor?

Answer 1

Refers to the pressure exerted within a plant cell

Question 2

In a turgid cell, is the internal water pressure high or low?

Answer 2

High (pushing hard against the cell wall)

Question 3

In turgid cell, what happens to the vacuole?

Answer 3

Vacuole enlarges (holds high volume of water/sap)

Question 4

If a cell is turgid, what happens to the water potential?

Answer 4

Water potential is higher internally

Question 5

In a flaccid cell, where does the internal water pressure act?

Answer 5

Pressure acts on the cell

Question 6

How big is a vacuole in a flaccid cell?

Answer 6

Normal size (not enlarged or reduced)

Question 7

What is the water potential in a flaccid cell?

Answer 7

Water potential is equal to external solution (no net movement of water)

Question 8

What is the internal pressure of a plasmolysed cell?

Answer 8

Internal water pressure is lower compared to external

Question 9

Size of vacuole in a plasmolysed cell

Answer 9

Vacuole size will be reduced

Question 10

Water potential in a plasmolysed cell

Answer 10

Water potential will be higher outside the cell (net movement of water will take place outside of cell)

Question 11

What is diffusion?

Answer 11

the random movement of molecules from an area of high concentration to an area of lower concentration

Question 12

What is osmosis?

Answer 12

movement of free water particles from an area of high concentration to an area of low concentration over a semi permeable membrane

Question 13

What is active transport?

Answer 13

movement of molecules from an area of low concentration to an area of high concentration using energy

Question 14

What is water potential?

Answer 14

the measure of the concentration of free water molecules in a solution

Question 15

Explain the water potential in an isotonic solution

Answer 15

the solution outside the cell has the samewater potential as inside the cell - no net movement

Question 16

Explain the water potential in a hypotonic solution

Answer 16

the solution outside the cell has a higher water potential then inside the cell - net movement of free water particles into the cell

Question 17

Explain the water potential in a hypertonic solution

Answer 17

the solution outside the cell has a lower water potential then inside the cell -net movement of free water particles out of the cell

Question 18

Do concentrated solutions have a high or low water potential?

Answer 18

Low