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A lab report is your opportunity to show that you understand what is going on in the experiment, which is really the most important part of doing it. In addition, I think it's actually very good practice for getting across your thoughts about the science you are doing in a manner that the reader can understand.

Science papers are very structured and typically contain sections with headings. Common sections for science reports -- those that involve the results of a study or experiment -- are abstract, introduction, method, results, discussion. If your paper is a response paper (responding to a prompt or question posed by the teacher) you may divide your paper into any appropriate sections and provide headers.

When you are writing a Science report, you should use the past tense to explain what happened. Avoid using passive verbs. For instance, instead of saying:

" When the lights were turned off, the mice reacted …"

You could say:

“ The mice reacted when I turned off the lights.”

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