Hello,

The process of seed germination includes the following five changes

1. Imbibition :- It is the first stage of seed germination. Imbibition results in swelling of the seed (absorption of water by the dry seed ) as the cellular constituents get rehydrated. The swelling takes place with a great force. It ruptures the seed coats and enables the radicle to come out in the form of primary root. In this way the Imbibition takes place.

2. Respiration :- The imbibition of water causes the restart of metabolic activity rehydrated seed. At the start of this step the respiration may be anaerobic (due to the energy provided by glycolysis) but it soon becomes aerobic as oxygen begins entering the seed. which helps the seed germination process.

3. Effect of light on seed germination :- Plants vary greatly in response to light with respect to seed germination.

4. Mobilization of Reserves during seed Germination and Role of Growth Regulators

5. Development of Embryo Axis into Seedling

Metabolic changes occurs during seed germination as Seed imbibition triggers the action of various metabolic process such as  synthesis of hydrolytic enzymes which resulted in hydrolysis of reserve food into simple available form for embryo uptake , reserve mobilization , phytohormonal regulation , glyoxylate cycle and respiration process.

Good luck