Chap 1 : Movement of subtance

Question 1

What is diffusion

Answer 1

Net movement of particles from a region of a higher concentration to a region of lower concentration

Question 2

What is osmosis

Answer 2

Net movement of water molecules from a solution of higher water potential to a solution of lower water potential through a partially permeable membrane

Question 3

What is water potential

Answer 3

Tendency of water molecules to move from one place to another

Question 4

Does a dilute have a higher water potential or a lower water potential

Answer 4

Higher water potential

Question 5

What happen to animal cell in dilute solution

Answer 5

Cytoplasm has lower water potential that surrounding solution, water enter cell through osmosis through the partially permeable membrane ➡ cell expands and burst

Question 5

Does a concentration have a higher water potential or a lower water potential

Answer 5

Lower water potential

Question 6

How oxygen is transported in human lungs, through diffusion or osmosis

Answer 6

Oxygen diffuses from the air spaces in the lungs into blood

Question 7

What happen to plant cell in dilute solution

Answer 7

Cell sap has a lower water potential compare to surrounding solution, water enter cell by osmosis through the partially permeable cell membrane ➡ cell expands and become turgib but the cell wall prevents it from bursting

Question 8

What happen to animal cell in concentrated solution

Answer 8

Cytoplasm has higher water potential compared to surrounding solution and water travel out by osmosis through the partially permeable membrane ➡ cell shirks and become crenated ( little spike )

Question 8

What happen to plant cell in concentrated solution

Answer 8

Cell sap has a lower water potential compare to surrounding solution, water travel out of cell by osmosis through a permeable cell membrane ➡ cytoplasm shirks away from cell wall and the cell become plasmolysed ➡ plant cell becom flaccid

Question 9

What happen if cell is in the same water potential

Answer 9

Cytoplasm has same water potential as surrounding solution ➡ same number of molecules enter and leave the cell ➡ no change in shape and size