Fruits are available in spring and fall.
For all of the species you can measure time and distance when dropping the fruits from varying heights. If you have a fan to produce a breeze you can see what effect that has on distance for each kind. Water Movement Demonstrate the way that water moves up through the inside of a plant by placing a cutting in colored water or ink. Celery stalks and carnation stems work well. Pollination Pollination, or transfer of pollen from a stamen to a stigma, is necessary in order for sexual reproduction to take place in seed plants.