MOVEMENT IN AND OUT OF CELLS 2

Question 1

what are the four factors that influences diffusion?

Answer 1

• temperature
• surface area
• concentration gradient
• diffusion distance

Question 2

why is water important as a solvent?

Answer 2

• transport medium in blood as digested food, antibodies and hormones dissolve in it
• provides medium in which substances dissolve in living cells and can react together
• reactant for photosynthesis and used for turgor pressure (in plants)
• moves in and out of cells by osmosis

Question 3

what happens when plant cells are placed in water?

Answer 3

water molecules will pass into the vacuole, causing the vacuole to expand outwards, pushing the cytoplasm and cell membrane out against the wall with a pressure called turgor pressure

Question 4

what happens when cells are placed into a solution of equal water potential?

Answer 4

water will move out an into the cells equally

Question 5

plant cells in a solution of slightly lower water potential

Answer 5

the lose water, turgor pressure decreases, lose strength. they are flaccid

Question 6

much lower water potential than themselves

Answer 6

lose water. cytoplasm + vacuole contents shrink so much that the cell membrane tears away from the cell wall. these are said to be plasmolysed

Question 7

when plant cells are _____, plant is ______

Answer 7

turgid, erect

Question 8

when cells are _____ or _______, plant is _______

Answer 8

flaccid or plasmolysed, wilting