The Xylem

Question 1

What is transpiration?

Answer 1

the evaporation of water from leaves, through the stomata

Question 2

What is cohesion?

Answer 2

water molecules stick together bc they are polar

Question 3

What is the xylem?

Answer 3

transports water and minerals
directon - up only

hollow tube made of dead cells and has no cell walls

Question 4

What is cohesion in xylem or plants?

Answer 4

transpiration of water through stomata creates low pressure at top of xylem

water in the xylem is pulled up creating tension bc water molecules stick to each other by cohesion

water molecules are sucked up to the leaves (like a straw)

Question 5

What factors affect rate of transpiration?

Answer 5

temperature - high temp increase the rate of transpiration

light - more stomata open when there is more light which increases transpiration

humidity and wind - affect the water vapour gradient - steeper the vapour gradient, the faster the rate of transpiration