transport in cellz Flashcards
what does turgid mean
enlarged and swollen with water
what does plasmolysed mean
a cell that has collapsed
what does active transport require
it requires energy (ATP)
what happens in active transport
molecules/ions move against a concentration gradient across a semi permeable membrane
what does phloem do
transports dissolved sugars from the leaves to the rest of the plant
what does xylem do
transports water and mineral ions from the roots to the leaves
phloem cells are elongated and have pores through which the sap can flow, this is called
translocation
xylem cells are …., …… and strengthened and waterproofed by lignin
this is called the ………
dead
hollow
transpiration stream
guard cells control
the opening and closing of the stomata
most chloroplasts are
at the top of the cells
the top surface has a ……. to act as a barrier to stop ……. evaporating from the cells
thick waxy cuticle
water
….. of photosynthesis happens in chloroplasts
80%
mature xylem vessels
contain no cytoplasm
have tough walls containing lignin
what is the role of the leaf
sit of photosynthesis
site of water loss by transpiration
site of gas exchange
what is the role of the stem
gives the plant structure/support
contains xylem and phloem for transport
can photosynthesise
transpiration stream