HMH Unit 3.1 Day Two

​So far, you've learned that plants need water, air, and light to grow and survive. But how do they use the water, air and light?

​Well, plants need food, but they don't eat other plants to get food. So how do plants get the food they need?

Plants change carbon dioxide and water into oxygen and sugar through a process called photosynthesis. Light energy from the sun is needed for photosynthesis to take place. ​

Plants make the food they need to survive and grow by carrying out photosynthesis. This food contains energy stored as matter. The matter in the food is made up of sugars and comes from the carbon dioxide in the air and water. The energy stored in the sugars was once light energy from the sun. Oxygen is released as a waste material into the air.​