Swede seedling germinating (Brassica napus)Ref: 80018731
Germinating seed. Image 3 of 4. Coloured scanning electron micrograph (SEM) of a late stage in the germination of a plant seed. The radicle (white), the embryonic root, is growing downwards in a response to gravity that is called geotropism. The root 'hairs' increase the ability of the root to obtain water and nutrients from its surroundings.