How Does GCSE Biology - Plant Hormones - Tropisms & Auxins Work?

Plants can sense directions and move towards or away from things, it’s like they have a superpower called tropisms.

Imagine you're playing with a toy car that always turns toward the light when you shine a flashlight on it. That's kind of what plants do, but instead of a flashlight, they use sunlight. When they detect light, special chemicals inside them, called auxins, tell parts of the plant to grow more in one direction.

Think of auxins like little helpers who make the plant bend. If there's more light on one side, the auxins move to the darker side, telling that part of the plant to stretch and grow longer. This makes the plant lean toward the light, just like you might lean toward your favorite toy.

Auxins also help plants react to other things too, like gravity. If a seed starts growing upside down, auxins help it know which way is up so it can grow straight again, kind of like how you know when you're standing on your head! Plants can sense directions and move towards or away from things, it’s like they have a superpower called tropisms.

Imagine you're playing with a toy car that always turns toward the light when you shine a flashlight on it. That's kind of what plants do, but instead of a flashlight, they use sunlight. When they detect light, special chemicals inside them, called auxins, tell parts of the plant to grow more in one direction.