D2.3 HL only

Question 1

Water potential

Answer 1

the energy required, per quantity of water, to transport an infinitesimal quantity of water from the sample to a reference pool of pure free water

Question 2

kilopascals

Answer 2

one thousand times the unit of pressure and stress in the metre-kilogram-second system

Question 3

megapascals

Answer 3

a unit of pressure or stress, commonly used to measurewater potentialin plants

Question 4

𝛹w = 𝛹s + 𝛹p

Answer 4

equation for calcualting the total water potential of a system

Question 5

solution potential (𝛹s)

Answer 5

the water potential of a solution containing dissolved solutes; always a negative number

Question 6

pressure potential (𝛹p)

Answer 6

turgor potential or turgor pressure and is represented by Ψp. Pressure potential may be positive or negative

Question 7

transpiration

Answer 7

the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers

Question 8

hypertonic solution

Answer 8

any external solution that has a high solute concentration and low water concentration compared to body fluids

Question 9

hypotonic solution

Answer 9

a solution that has a lower concentration of solute compared to the cell

Question 10

isotonic

Answer 10

a solution that contains the same concentration of water and solutes