Biology
Plant Growth Hormones
Quick fact
The first plant hormone, auxin, was discovered through experiments by Charles Darwin and his son Francis in the 1880s, who observed that grass seedlings bent toward light when the tip was present but not when it was removed.
Why this is interesting
Have you ever wondered how a plant 'knows' to grow toward sunlight or why a cut stem can sprout roots? The answer lies in tiny chemical messengers called plant growth hormones.