The abstract should be written in the same tenses as the main report.

An abstract should consist of about no fewer than 1200 words of each part of the report.

The abstract is aimed at helping potential readers identify whether your report is relevant to their research interests. 

Reports of laboratory experiments in disciplines such as biology, chemistry and physics generally include the following 4 sections: Title, Abstract, Method, and References.

Scientific reports follow special guidelines, oppositely different from  other academic writing in terms of style and vocabulary.

At graduate level or above, your research may add to an international body of data on your particular area of study.

Scientific research  usually is aimed to prove a hypothesis or to validate the work of others.

Topics of a scientific report may include an experiment you have conducted,  a survey you have carried out,  a comparison of alternative proposals to deal with a situation.

A scientific report is a description of a scientific investigation which you have done.

Your conclusions on a topic is usually followed by an assessment of the evidence.