I thought this was cool!

Okay, so did you ever wonder how the heck plants knew they needed to grow taller? Seriously, haven't you ever wondered why some plants grow until they hit sunlight and then bearly grow at all until they are overshadowed by another plant... at which time the shoot up until they are the tallest again? Trees in particular do this.

Well, it all has to do with a molecule called a cytochrome. This molecule is "C" shaped. But when its bombarded with photons (light energy in packet form) the center bond of the molecule absorbs the energy and twists so that the molecule is "S" shaped. When the molecule is "S" shaped the metabolism of the plant shifts from growing to storing, so it starts storing up sugars. But when the plant is overshadowed by another plant, there isn't enough energy to keep the molecule in the "S" shape, so it returns to the "C" shape, which then binds to certain proteins, setting off a cascade of changes and the plant starts growing taller again!

Exciting? I KNOW!