Diffusion And Osmosis

Question 1

Diffusion

Answer 1

The movement of molecules from a region of high concentration to low

Question 2

Osmosis

Answer 2

Movement of water across a semi permeable membrane from a region of high water concentration to low

Question 3

Passive transport

Answer 3

Doesn’t require energy

eg osmosis

Question 4

Active transport

Answer 4

Movement of molecules against a concentration gradient which requires energy

Question 5

Osmoregulation

Answer 5

Control or balance of water and salt levels in an organism

Question 6

Plasmolysis

Answer 6

The loss of turgor pressure in a plant cell due to the loss of water by osmosis

Question 7

Turgor pressure

Answer 7

Pressure of the cell contents (eg vacuole) against the cell wall

Question 8

Turgid

Answer 8

A plant cell in which the contents are pushing against the cell wall due to turgor pressure

Question 9

Osmosis and food prep

Answer 9

Food-> sugary/salty solution to preserve it
No bacteria/fungi can grow
Their cell surroundings have a higher solute conc. so water moves out of their cells by osmosis
Cells shrivel and die
Eg fish in salt, jam in sugar

Question 10

Animal cell osmosis

Answer 10

More water outside than inside the cell-> water will emter cell -> burst and die
More water inside than outside-> water leave cell-> shrivel up may die

Question 11

Plant cell osmosis in less concentrated solution

Answer 11

Water in-> vacuole fills & swells-> cytoplasm & vacuole give turgor pressure-> cell is turgid
Eg lettuce

Question 12

Plant cell osmosis in more concentrated solution

Answer 12

Water out->vacuole &cytoplasm shrivel -> move away from cell membrane-> solution fills space >cell is flacid = plasmolysis