A student is setting up a light microscope to observe a slide of onion skin cells.
Which of the following procedures should the student use first to safely bring the cells into focus?
Use the highest power objective lens and move the stage closer to the lens while looking through the eyepiece.
Use the highest power objective lens and move the stage away from the lens while looking through the eyepiece.
Use the lowest power objective lens and move the stage closer to the lens while looking through the eyepiece.
Use the lowest power objective lens and move the stage away from the lens while looking through the eyepiece.
44 exam-style questions on OCR GCSE Biology Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.