Unit 2 // Osmosis + Transpiration

Question 1

Osmosis

Answer 1

The movement of water from a dilute solution to a more concentrated solution through a selectively permeable membrane

Question 2

Transpiration

Answer 2

The evaporation of water from mesophyll cells, followed by diffusion through the leaf air spaces and stomata

Question 3

Turgor

Answer 3

The state of a plant cell when it has gained enough water by osmosis for the cell membrane to push against cell wall, making the cell firm

Question 4

Plasmolysis

Answer 4

A plant cell is plasmolysed when it has lost water by osmosis and it’s membrane separates from cell wall

Question 5

Change in mass

Answer 5

= final mass - initial mass

Question 6

Percentage change in mass

Answer 6

Change in mass / initial mass X 100

Question 7

Cell lysis

Answer 7

If too much water enters an animal cell by osmosis it will swell up and eventually burst
This occurs because an animal cell does not have a cell wall to limit the amount of water entering the cell

Question 8

Flaccid

Answer 8

When plant cells lose water by osmosis they cannot remain turgid and wilting occurs. The cella are not turgid as are described as flaccid