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Biological Material at the Microscopic Level · Part 3 of 3
6 exam-style questions with model answers, plus 12 quick multi-choice questions — every question on this part of the standard, grouped by the 3 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
Describe three differences you would see between onion bulb epidermis and moss leaf cells under a light microscope.
Explain why onion bulb epidermal cells contain no chloroplasts, while the cells of a moss leaf are packed with them.
Name one unicellular organism you could view in pond water. For that organism, name one feature it uses to move, one it uses to take in food, and state what a contractile vacuole does.
Explain why a freshwater unicellular organism such as Amoeba needs a contractile vacuole, and explain why its pseudopodia allow it to feed effectively.
Identify one specialised feature you would see in palisade mesophyll cells and one you would see in xylem vessels. For each, state the function of the cell and describe how the feature relates to it.
A student writes: "The palisade cells have lots of chloroplasts. Chloroplasts are for photosynthesis." Explain what is missing from this answer, and write an improved version for the same feature.