Osmosis Flashcards
1
Q
What is the role of the cell wall?
A
Limits the entry of water
2
Q
What do plants use water for?
A
Support
Transport
Transpiration
Photosynthesis
3
Q
Define Osmosis
A
Osmosis is the diffusion of water from a dilute solution to a more concentrated solution, through a selectively permeable membrane.
5
Q
Define transpiration
A
Evaporation from leaf cells followed by diffusion through stomata
6
Q
Name factors that effect the rate of tanspiration
A
Wind/wind speed Temperature Surface Area Humidity (Vaseline)
7
Q
Explain how cells become Turgid
A
Surrounded by a weaker solution Vacuole expands Pushes cell membrane against cell wall Causes Turgor Cell wall stops membrane expanding too far
8
Q
Explain how cells become plasmolysed
A
Surrounded by a more concentrated solution Cell loses water Loses Turgor Membrane pulls away from cell wall Vacuole shrinks Process called plasmolysis
9
Q
Explain the weighing method to measure transpiration
A
Record mass of apparatus+plant
Leave for given time
Record mass+change at end
Divide change in mass by time(to find rate)
Name variable(Wind/temps tire/humidity)
Repeat for reliability to obtain averages
