Question detail

A-Level Biology application 21: a microscopy observation is provided for respiration. Which answer is strongest?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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MCQ

Type

practice

Style

Topic

Energy transfers official content

Question

A. Use a microscopy observation to plan the method, name the independent variable, dependent variable and a controlled variable, then evaluate reliability, uncertainty and validity before linking evidence to Required practical 9: investigate the effect of a named variable on respiration rate in cultures of single-celled organisms.
B. Repeat the topic title for respiration without using the evidence or explaining a mechanism.
C. Ignore variables, controls, uncertainty and biological evidence when reaching the conclusion.
D. Use vague wording and avoid linking structure, process, data or mechanism to the objective.

Answer

The correct answer is: Use a microscopy observation to plan the method, name the independent variable, dependent variable and a controlled variable, then evaluate reliability, uncertainty and validity before linking evidence to Required practical 9: investigate the effect of a named variable on respiration rate in cultures of single-celled organisms.

Explanation

This option is creditworthy because it uses a specific context, stays anchored to the learning objective, and explains the biological reasoning. For practical reasoning, state the method, independent variable, dependent variable and one controlled variable; keep the control constant; then evaluate validity, reliability, accuracy, precision, uncertainty, risk and possible improvements.

Common mistake

energy transfers practical reasoning mistake

Describing Required practical 9: investigate the effect of a named variable on respiration rate in cultures of single-celled organisms without naming variables, controls or evaluation of the evidence.

For practical reasoning, state the method, independent variable, dependent variable and one controlled variable; keep the control constant; then evaluate validity, reliability, accuracy, precision, uncertainty, risk and possible improvements. Then link the practical evidence to Required practical 9: investigate the effect of a named variable on respiration rate in cultures of single-celled organisms.

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