Darwin and Went's investigation into auxin and oat coleoptile growth

Darwin cut the tip of an oat coleoptile plant he relplaced the tip back and the plant started growing towards the light again Went cut the tip of the plant then placed it on an agar jelly block he then put the block with tip on top on the rest of the plant the plant started to grow again Went then placed the agar on one side of the tip in the dark the plant bent away from the side the agar was on