Manu wanted to verify if fertilizers help plants to grow well. He took a potted plant, mixed fertilizer with the soil and took good care of the plant. He also maintained a record of the growth of the plant. The error in Manu's experiment was
Answer: He didn’t grow a plant without fertilizer.
Explanation: Manu has nothing to compare his plant to. Meaning, he cannot prove that fertilizers help plants grow. He needs to grow a plant with and without fertilizer.
