Autotrophs only heterotrophs only
both autotrophs and heterotrophs
transform energy in sunlight
into chemical energy
aut eophs only
utilize chemical energy in organic
molecules as a source of energy
derive energy by consuming
organic matter
produce the pigment chlorophyll
perform a series of reactions
called the Calvin cycle
perform a series of reactions
called the Krebs cycle

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.