Chapter 2: water in plant life

Question 1

why is water in plants limiting

Answer 1

97% of the water a plant picks up is lost through transpiration

Question 2

what percent of water is used for growth and development

Answer 2

2%

Question 3

high tensile strength

Answer 3

the ability to resist pulling/ breaking apart

Question 4

cavitation

Answer 4

when a water column breaks as a result of the air bubble

Question 5

diffusion

Answer 5

movement from less entropy (order) to disorder

Question 6

when entropy increase what do you get

Answer 6

more disorder

Question 7

explain what happens when the concentration in the cell is greater than the outside

Answer 7

water moves into the cell, but solutes remain thus causing the cell to expand

Question 8

more solute in water means

Answer 8

lower free energy

Question 9

the more solutues you have, what happens to the potential

Answer 9

it is lower

Question 10

negative potential does what to pressure

Answer 10

lowers pressure

Question 11

positive potential does what to pressure

Answer 11

raises pressure

Question 12

as soon as you dissolve something in water, what happens to the potential

Answer 12

it decreases

Question 13

what is the water potential equation

Answer 13

water potential= solute potential + pressure potential

Question 14

how does the cell wall influence water status

Answer 14

cell wall elasticity defines the relationship between turgor and pressure

Question 15

hydraulic conductivity

Answer 15

how readily water can move across membranes

Question 16

what do aquaporins do

Answer 16

facilitate water movement; can help water flow move better

Question 17

what determines if an aquaporin is opened or closed

Answer 17

change in pH and concentration of Ca ions

Question 18

abscisic acid

Answer 18

hormone that is a signal for water stress

Question 19

as water potential decreases, what accumulation increases

Answer 19

abscisic acid and solute accumulation

Question 20

solute accumulation

Answer 20

mechanism that plants have; accumulate solutes from environment or other plants have certain molecules that they synthesize