Reading biological diagrams, tables and graphs

≈ 48 min

Reading biological diagrams, tables and graphs

Scientific representations compress evidence. A diagram may show relationships but not scale; a table can show exact values; a graph can show patterns. Read titles, axes, units, keys and sample sizes before explaining. Distinguish a direct observation from an inference. For example, a line graph may show dissolved oxygen falling after a nutrient input; the inference that decomposition is responsible needs supporting biological knowledge.

Work it through

A graph shows insect numbers rising after rainfall. The observation is the rise. A possible explanation is more plant growth and food, but rainfall could also change breeding or migration. State the evidence and the uncertainty separately.

Mastery target

Extract a precise claim from a representation, support it with data and state one justified limitation.

What should be checked before interpreting a graph?

Axes, units, key and title

Only the colour of the line

The learner's preferred conclusion

The final answer first

Name the key biological term from Reading biological diagrams, tables and graphs: enter the term that best fits the explanation and visual model.

Which statement is an inference rather than a direct observation?

The oxygen fall was probably caused by increased decomposition.

Dissolved oxygen fell from 8 to 4 mg/L.

The graph has a y-axis.

The sample was taken on Tuesday.

Which statement corrects a common misunderstanding in Reading biological diagrams, tables and graphs?

Correct: A line between data points does not mean every intermediate value was measured.

A single observation is enough to prove every biological claim.

Scientific terms are interchangeable whenever they sound similar.

A process always has exactly the same result in every environment.