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An experiment like this needs to begin with some observations, then question and after which, one makes the hypothesis. Following this, you made the prediction. All these constitute part of the Introduction section of your project report, when you do write it at the end.
I see that you have the question and the prediction. I would request you to include the observation and hypothesis in there as well. What are some of the things you have observed either in nature or by reading scientific books/texbooks/journal articles about plant growth and light? From all these, can you create a hypothesis? A hypothesis here, can be a statement about how all plants may work in nature. Once you form that then you think about testing this hypothesis.
To test the hypothesis, you narrow the big picture down to one or more experiments, which I see that you have created. It is at that point that you narrow the hypothesis down to the experiment and create the prediction.
In an experiment like yours, you must state the following as well, before you begin your experiment:
What is your independent variable? In your case it will be light
How many different variables will you have?
How many hours of light and darkness will you have?
Will you water them? Feed them? How often?
What is your control?
How many plants/seeds will you use in each group?
How long will you observe them? what are you looking for?
What data will you collect? How will you measure them?
How many times will you repeat the experiment?
How will you know if your hypothesis was supported or not.
The design of the experiment and its description has to be clear.
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It is a nice comment from the mentor with detailed guidelines.
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