Germination

Germination is the process by which plants emerge from seeds and begin their growth. There are four main factors that can influence germination: light temperature, water, and oxygen. Many seeds are unaffected by light (well duh! they are underground) but some seeds, like those in the rainforest, wont begin to germinate until light shines through. Temperature affects cellular metabolic and growth rates. There is often a prime temperature for seed to germinate. Water is a requirement for germination, however too much water can drown the seeds. Imbibition is the uptake of water by the seed which lad to the swelling and breaking of the seed coat to allow the seedling to emerge and start growing roots and leaves. Lastly oxygen is required in germination for metabolism. It is used in the aerobic respiration which is the main source of energy for the seedling until it grows leaves.