Physicology Of Plants

Question 1

Transpiration

Answer 1

The lose of water out of leaves
1. The drying power of air creates evaporation of H2O from the leaf
2. The next H2O molecule is pulled next to it by hydrogen bonding and this cohesion of water molecules creates a tension all the way down the xylem to the roots which continuously pulls the water up from the roots->stems->leaves->air=>colesion tension theory

Question 2

Translocation

Answer 2

1. Loading of sugar from leaf photosynthetic cells into the phloem reduces water potential which causes it to uptake H2O from xylem by osmosis.
2. The uptake of water causes positive pressure that forces the sap(sugars) to move from the source(leaf) to the sink(fruit roots)=> pressure-flow theory*