Nova Season 4 Episode 20 – The Green Machine

Aired : Jan 11 1978 | 42 Views |

Watch Nova season 4 episode 20 online for free. Botany is a neglected science and plants are all around us, but unfamiliar. NOVA examines our state of knowledge of how plants work: growth hormones, responses to light and shade, photosynthesis, root mechanisms and twining responses.