translocation and transpiration Flashcards
sugars made in the leaves by photosynthesis
must be transported to the rest of the plant
the transport of sugar is called
translocation
phloem cells are arranged
end to end in phloem tubes
what allows the movement of cell sap in phloem tubes?
small gaps in between phloem cells, allowing glucose to travel long distances
what is cell sap
a mixture of glucose and water
phloem can transport substances
up or down the plant
how are xylem tubes structured?
back to back xylem cubes in collums
why are there no small gaps in xylem tubes?
because xylem cells have no ends, meaning xylem tubes are just hollow tubes
what are xylem cells strengthened by?
lignin
what is the function of xylem
to transport water and minerals from roots to leaves, where the water can be used for photosynthesis
the flow of water up a xylem tube is driven by
the evaporation of water from the leaf
the evaporation of water from the leaf is called
transpiration
in xylem tubes, water can only flow
up the xylem tubes
what are the factors affection the rate of transpiration?
temperature, light intensity, air flow, humidity
how does light intensity affect the rate of transpiration?
brighter light means more photosynthesis means stomata us open for more carbon dioxide to enterthe leaf meaning more water evaporates through the stomata
