won't germinate when the temperature is below 0 – 5°C or above 45 – 50°C.
             4. The effect of light is variable. Most seeds don't mind if it is light or dark. However, some germinate only in the dark. Others require light; the amount needed may be very small – one quick flash is enough in some cases. Once the young shoot begins to grow above the soil, light is needed for the leaves to make chlorophyll and start photosynthesizing. For plants, light is important. This can bee seen by growing a seedling in the dark. As if in an effort to reach the light it grows rapidly, becoming tall and spindly. The leaves don't expand and the plant is yellowish because the green chlorophyll can only be formed in the light. A plant in this state is called etiolated.
             1. Put the seeds inside a transparent plastic cup with cotton.
             2. Place it where daylight will reach it and where oxygen supply is enough, this will also assure atmospheric temperature.
             3. Add water every day to assure water supply.
             1. Place the seeds inside a transparent plastic cup with cotton.
             2. Place the cup inside a cardboard box to avoid contact with light.
             3. To assure the presence of oxygen punch little holes in the box.
             4. This plant will also be supplied with water every day.
             1. Place the seeds inside a transparent plastic cup with cotton.
             2. Place them where daylight will reach them and where oxygen supply is enough, this will also assure atmospheric temperature.
             3. Unlike the other experiments, this plant will not be supplied with water.
             1. Place the seeds inside a transparent plastic cup with cotton.
             2. Place the recipient inside a completely closed contained, preferably transparent so that it can have access to light and leave it in a place where it can have access to atmospheric temperature.
             3. To control the supply of water, a
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