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Biological Material at the Microscopic Level · Part 1 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.
Name the part of a light microscope that carries out each of these jobs, and state the job of the fine focus knob: (a) holds the slide in place, (b) controls how much light reaches the specimen, (c) can be turned to change magnification.
Explain why you must always begin on the lowest power objective and focus by moving the objective away from the slide rather than towards it.
Describe how to make a wet mount of a piece of onion epidermis, and state one stain you could use and what it would show.
A student's slide of a plant stem shows only a dark blur at ×400, and several round objects with thick black rims. Explain what has gone wrong with the preparation and how each fault should be corrected.