How do plants make oxygen?
Without plants there would be no oxygen in the atmosphere and no animals. A demonstration clearly shows how oxygen is made by pond weed. The glowing splint test for oxygen is shown in close-up. 07.52-09.52 What do plants need to grow? Supermarket shelves are stocked with living herb plants. We visit a commercial plant grower in Lincolnshire to find out how the ideal conditions for growth are created. A boiler and fans are used to maintain the ideal growing temperature. The boiler also produces carbon dioxide, which the plant uses as a raw material. The other important raw material is water, which is collected as rainwater. In winter it is too dark for the plants to grow quickly so special sodium lights simulate sunlight. 09.52-12.21 How does a leaf work? The leaf is where the plant combines carbon dioxide and water. With the help of a 3D graphic, we explore the layers that make up a leaf. We follow the path taken by carbon dioxide through the stomata and into the leaf. Zooming in on th
