AQA BIOL2~3rd June 2013~AS Biology (Now Closed) Watch
Continuous collumn of water, so water can flow upwards.
Adhesion between xylem wall and water molecules
Cohesion of water molecules by H-bonds
why is this good for rapid gas exchange in leaves? I forgot
U don't actually need to know the process!!
U just need to know about independent segregation and crossing over. Then u need to know how many cells and what type. And then be aware of the fact that the original cell divides once to produce two cells and these two cells divide to produce two cells each, giving u four genetically non identical daughter cells.
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Could someone please write a 6 mark answer for water transport in plants from the root to the leaf? I thought i got it until the mark scheme started talking about the active transport of ions :s Would be much appreciated
- Ions actively transported into xylem by endodermis
- This lowers the water potential of the xylem, causing water to move in by osmosis
- Continuous column of water up the xylem
- Hydrogen bonds between the water molecules give them cohesive properties
- This creates tension in the xylem
- Adhesion of water molecules and xylem wall also aids transpiration