Lab reports, like any other writing, have their own format and style. Their purpose is to communicate exactly what occurred in an experiment or observation and to clearly discuss the results. The essence of a scientific experiment is that it must be duplicable or repeatable. Other students should be able to read your report, do the experiment following your description, and get the same or similar results. If they can’t, your report isn’t good enough.
For SEC examination purposes, the grammar used during report writing is not examined. However, whenever possible, it is good practice that students learn how to use the third person passive voice in writing their report. This pdf document provides some tips on how to use the third person passive voice in writing reports.