"Biology lab #1" would not be an informative title, for example. In a minute or less a reader can learn the rationale behind the study, general approach to the problem, pertinent results, and important conclusions or new questions.
It is not to be a step by step description of everything you did, nor is a methods section a set of instructions. By the way, your notebook should contain all of the information that you need for this section.
Materials: The page length of this section is set by the amount and types of data to be reported.
There is no specific page limit, but a key concept is to keep this section as concise as you possibly can.
People will want to read this material selectively.
The reader may only be interested in one formula or part of a procedure.
Materials and methods may be reported under separate subheadings or can be incorporated together.
Continue to be concise, using figures and tables, if appropriate, to present results most effectively. The purpose of a results section is to present and illustrate your findings.
Make this section a completely objective report of the results, and save all interpretation for the discussion.
Summarize the study, including the following elements in any abstract.
Try to keep the first two items to no more than one sentence each.