Why do plants need water, light, and carbon dioxide?

Plants also need water for photosynthesis. Photosynthesis is what plants do to create their food, and water is critical to this process. Water enters a plant's stem and travels up to its leaves, which is where photosynthesis actually takes place. read more

The water from the leaves evaporates through the stomata, and carbon dioxide enters the stomata, taking the water's place. Plants need this carbon dioxide to make food. Transpiration - this exchange of water for carbon dioxide - only occurs during the day when there is sunlight. read more

Water and sunlight are not the only ingredients that plants need to produce food. In addition to light and moisture, plants need carbon dioxide from the air, which is converted into sugars in a process known as the Calvin Cycle. read more

The role of plants in converting carbon dioxide into oxygen is essential for humans and other living beings that need oxygen. Plants provide food for humans and animals and control the amount of carbon dioxide in the atmosphere. read more