When there is water , the enzymes in the cotyledons become active
Amylase breaks down the stored starch to maltose,
and proteases break down the protein molecules to amino acids.
Once the testa ruptures more oxygen reaches the embryo.
Energy is necessary for growth of the embryo
Energery is released when oxygen reacts with glucose during cell respiration.
A temperature range of 10-40 c, is necessary for enzymes in the seed to work.