HARD
AS and A Level
IMPORTANT
Earn 100
Explain how active loading of sucrose into companion cells leads to a relatively high pH of about pH 8 in the cytoplasm of the companion cells.
Important Questions on Transport in Plants
HARD
AS and A Level
IMPORTANT
Explain how active loading of sucrose into companion cells leads to negative charges inside the companion cells relative to the outside. (There is a difference in electric potential across the cell surface membrane, with a potential of about -150mV on the inside.
HARD
AS and A Level
IMPORTANT
Explain how active loading of sucrose into companion cells leads to the relatively large amounts of ATP present inside the companion cells.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a seed could be a sink.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a seed could be a source.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a leaf could be a sink.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a leaf could be a source.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a storage organ could be a sink.
MEDIUM
AS and A Level
IMPORTANT
Translocation of organic solutes takes place between sources and sinks. Briefly explain under what circumstances a storage organ could be a source.
