Seed GerminationSeed germination is the process by which seeds or spores germinate and begin to grow after being dormant for some time. The length of dormancy varies depending on the environmental conditions in which the seed is surrounded. The environmental conditions that determine when a seed will begin to germinate are temperature, oxygen, amount of light and water supply (Germination, accessed February 23, 2010, http://www.answers.com /topic/germination). .For a seed to start germinating, the temperature must be between 25 and 30 degrees Celsius. Radish seeds, however, prefer to grow at cooler temperatures, 10 to 18 degrees Celsius. The seed also requires large amounts of oxygen to start germination, which comes from air and soil moisture. If the seed is sown deep in the soil, it will not germinate due to lack of oxygen. Light is necessary for germination to begin, but the germination of some seeds is hindered by light (Factors Affecting Seed Germination, accessed February 23, 2010, http://www.tutorvista.com/content/biology/biology -iv/plant-growth-movements/affectant-seed-germination.php). Water supply is the main requirement for germination because there is no water in the embryo of a mature seed. The seed therefore needs to absorb water to become active and begin to germinate. (Yahya, H, 2010, The Miracle in the seed, accessed March 13, 2010, http://www.harunyahya.com/books/science/seed/seed6.php). If a plant is watered with a small amount of water, it becomes weak, which happens when it loses water faster than it gains it from the soil. Before the plant begins to lose strength, the pores in the stomata close, which helps keep water in but allows less carbon dioxide to enter the medium.... ..e_difference_between.html?cat=32Hoyum, K, The Difference Between Potting Soil and Garden Soil, accessed March 3, 2010, http://www.gardenguides.com/101529-differences-between-potting-soil-garden -soil.htmlMulch, accessed March 9, 2010, http://users.netconnect.com.au/~ewood/mulch.htmlYoung, I, 2004, Plants and pH, accessed March 10, 2010, http://angel- patti03.tripod.com/id3.html.Doser, A, 2003, pH and its effects on plants, accessed March 10, 2010, http://www.usc.edu/CSSF/History/2003/Projects/S1607 .pdfPlant Nutrients, accessed March 10, 2010, http://www.ncagr.gov /cyber/kidswrld/plant/nutrient.htm(Yahya,H, 2010, The Miracle in the seed, accessed March 13, 2010, http: //www.harunyahya.com/books/science/seed/seed6.php)McKenzie, R, May 15, 2003, Soil pH and Plant Nutrients, accessed March 12, 2010, http://www1.agric.gov .ab.ca/$department/deptdocs.nsf/all/agdex6607