What do Plants Need to Thrive?

Lily loved her little sunflower plant. It sat on her windowsill, reaching for the sun, and she remembered to give it a little water every morning. One day, her teacher, Ms. Anya, asked the class a question: "What do plants need to grow big and strong?"

"Sunlight!" shouted one student. "Water!" called out another.

Ms. Anya smiled. "You're both right! But how can we prove it? How can we be sure that plants really need both sunlight and water?"

Lily thought for a moment. "We could do an experiment!" she said.

Ms. Anya clapped her hands. "Excellent idea, Lily! Let's plan one together. We want to find out if plants need sunlight to grow, and if they need water to grow. To do this, we need to be careful. When we test something, we only change one thing at a time. That way, we know exactly what made the difference."

So, they decided to get three small bean plants, all about the same size.

• Plant A would get sunlight and water. This plant would be their "control" – what usually happens.
•  
• Plant B would get water, but no sunlight. They would put it in a dark cupboard.
•  
• Plant C would get sunlight, but no water.
•  

"Every day," Ms. Anya explained, "we will look at each plant very carefully. We'll draw pictures of them and write down what we see. Are they getting taller? Are their leaves green? What happens to the plant that doesn't get sunlight? What happens to the plant that doesn't get water?"

Lily was so excited! She knew that by carefully watching and recording, they would discover the amazing truth about what plants need to thrive.