Watch phototropism in action:
1 Place some large seeds like peas, beans or sunflowers in a pot of growing mix, you need to bury the seeds about 2cm down in the pot.
2 Water your seeds, place them in a warm spot like on top of your refrigerator to grow.
3 Check your seeds every day and when you see that the growing mix is drying out water them again. Keep your mix reasonably wet so the seeds will grow.
4 When you see the green shoots coming up, place your pot on the window sill.
5 Keep watering your plants and you will see that as the plants get taller the stems will start to bend towards the light.
6 Once the stems have bent then you can turn the pot around so the bent stems are facing away from the window.
7 You will see that the plant stems will bend back the other way towards the light again. This will take a couple of days to happen.