Osmosis- A special case of diffusion

Question 1

The definition of osmosis

Answer 1

Osmosis is the movement of water from an area of higher water potential to an area of low water potential across a partially permeable membrane

Question 2

How do water molecules enter the cell

Answer 2

solution outside the cell has a lower concentration of dissolved substances than the solution inside the cell, there will be a concentration gradient that encourages water molecules to move into the cell

Question 3

What do we mean by osmotic concentration

Answer 3

measure of the concentration of the solutes in a solution that have an osmotic effect

Question 4

What do we mean by isotonic solution

Answer 4

the osmotic concentration of the solutes in the solution is the same as that in the cells

Question 5

What do we mean by hypotonic solution

Answer 5

the osmotic concentration of solutes in the solution is lower than that in the cytoplasm of the cells

Question 6

What do we mean by hypertonic solution

Answer 6

the osmotic concentration of solutes in the solution is higher than that in the cytoplasm

Question 7

Why does osmosis need to be controlled

Answer 7

too much water into the cell may cause the cell to burst

too little water into the cell may cause the cell to shrink

Question 8

What happens when osmosis gets out of control

Answer 8

the cytoplasm loses its internal structure and the chemical reaction that normally take place stop working

Question 9

In plant cell what stops the cell from bursting

Answer 9

cellouse cell wall

Question 10

What is pressure potential (inward pressure)

Answer 10

Pressure potential is the hydrostatic pressure exerted on water in a cell.

Question 11

What do we mean by turgor in a plant cell

Answer 11

Pressure exerted by fluid in a cell that presses the cell membrane against the cell wall.

Question 12

What is the effect of the rigid structure of cells in plant cells

Answer 12

it supports the stems and leaves of plant

Question 13

What is incipient plasmolysis

Answer 13

so much water has moved out of the cell by osmosis that the tugor us lost and the cell membrane begins to pull away from the cell as the protoplasm shrinks

Question 14

What is plasmolysis

Answer 14

Plasmolysis is the process in which cells lose water by to osmosis in a hypertonic solution and the cell walls are destroyed

Question 15

What do we mean by water potential

Answer 15

measure of potential for water to move out of a solution by osmosis

Question 16

What do we mean by turogour pressure

Answer 16

the hydro static pressure generated as the cell contents push against the cell wall of plant cell as a result of the movement of water into the cell by osmosis

Question 17

What is the water potential definition of osmosis

Answer 17

the net movement of water molecules from an area of high water potential to an area of lower water potential through a PPM

Question 18

What is the osmotic potential definition of osmosis

Answer 18

the net movement of water molecules from an area of higher osmotic potential to an area of lower osmotic potential though a PPM