IB Biology SL Extended Essay Example

The student communicated a specific and relevant research topic clearly, linking metformin exposure to rice germination in a way that makes the investigation purposeful.

The student's research question is focused, quantitative, and workable, which gives the essay a strong investigative direction.

The student developed a generally suitable method and showed evidence of refinement from preliminary trials, especially in controlling moisture and improving the procedure.

Some explanatory claims go beyond what the student's method directly measures, so parts of the rationale become more speculative than the data can support.

The method is not fully precise in how the final treatment concentrations are experienced by the seeds, which weakens reproducibility and validity.

The student's justification for the concentration range is not biologically strong enough, and the relationship between environmental context and chosen doses is not fully resolved.

The student uses a good range of scientific terminology correctly in many places, including germination concepts, variables, T50, and statistical language.

The student applies source material in a generally relevant way to explain the biology behind germination and why metformin might influence it.

The student's explanation of the germination metric is clear and helps the reader understand what was measured and why it matters.

Some terminology and notation are inconsistent, which makes parts of the explanation harder to follow and lowers precision.

Several mechanistic explanations are presented too confidently even though the experiment did not directly measure the processes being described.

A few source-based links are only partly relevant to rice germination, so the science is not always applied as tightly as it could be.