How does a seed germinate ?

Here, the children are learning how to germinate a seed. Each of them picked 4 seeds of their favourite flowers and pushed them into a pot of soil, about 2cm below the surface of the soil. After that, they cover up the seeds and add a little water to the soil. For a seed to germinate, it needs water, warmth and air. Does it need sunlight ? No, it does not as the seed cannot make food at this stage yet.