Water potential

Question 1

What is the function of calibration curves

Answer 1

to determine an unknown concentration using a series of standard samples

Question 2

What is water potential

Answer 2

the tendency of water to move from an area of hgih water potential to an area of low water potential

Question 3

What is water potential determined by

Answer 3

concentration of solutes

Question 4

Why is percentage change in mass cacluated instad of the actual change

Answer 4

• potato discs may not have same starting mases
• allows comparison between different disc

Question 5

What are the control variable of the practical

Answer 5

• volume of sucrose solution
• size of potato chips
• length of time left in solution
• dab each potato dissc with paper towels

Question 7

How is calibration curve used to find the concentration of plant tissue

Answer 7

• plot a calibration curve of percentage change in mass against concentration
• find the x intercept where the plant tissue is isotonic to the sucrose solution

Question 8

What occurs when plant tissue is place in a hypotonic solution

Answer 8

• water moves into the plant tissue by osmosis
• plant tissue increases in mass

Question 9

What occurs when a plant tissue is places in a hypertonic solution

Answer 9

• water moves out via plant tissue via osmosis plant tisue decreases in mass

Question 10

Why are the potato discs left in the solution for 20 minutes

Answer 10

allow time for osmosis until plant tisue reaches equilibrium with its surrounding solution