transpiration

Question 1

define transpiration

Answer 1

the loss of water from the plant

Question 2

what is transpiration caused by

Answer 2

the evaporation and diffusion of water from the plants surface

Question 3

where does transpiration take place

Answer 3

the leaves

Question 4

name the 4 things that affect the rate of transpiration

Answer 4

• light intensity
• temperature
• air flow
• humidity

Question 5

how does light intensity affect transpiration

Answer 5

brighter light=greater rate of transpiration

-stomata begin to close when it is dark

Question 6

how does temperature affect transpiration

Answer 6

warmer=greater rate

-water particles have more energy to evaporate and diffuse out of the stomata

Question 7

how does the air flow affect transpiration

Answer 7

better air flow=greater transpiration rate

-water vapour is swept away, low conc of water, diffusion is quicker

Question 8

how does humidity affect transpiration

Answer 8

drier air=greater rate

-quicker diffusion because really high conc in one place and really low conc in another

Question 9

what can be used to estimate transpiration rate

Answer 9

photometer, water uptake=water loss

• record distance moved by the bubble per unit
• keep condition constant