Loading subjects
Biological Material at the Microscopic Level · Part 2 of 3
4 exam-style questions with model answers, plus 8 quick multi-choice questions — every question on this part of the standard, grouped by the 2 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
A microscope has a ×10 eyepiece. A student uses the ×40 objective. State the total magnification. The field of view at this magnification is 0.4 mm across, and 8 cells fit across it. Calculate the length of one cell in μm.
A student measures the field of view as 4.0 mm across on the ×4 objective. They then turn to the ×40 objective and write in their book that the field of view is still 4.0 mm. Explain what is wrong with this, calculate the correct value, and explain why the field of view matters when you are trying to find a specimen.
List four conventions a biological drawing must follow, and state two things that must be written on the drawing.
A student's drawing of onion epidermis shows neatly drawn cells of equal size in perfectly straight rows, each cell a separate rounded shape with white space between them, with the cytoplasm shaded grey and a nucleus drawn in every cell. Explain why each of these features makes the drawing a poor record of what was on the slide.