A student observed onion root tip cells under a microscope. In a field of view containing 200 cells, 184 cells were in interphase and 16 cells were undergoing mitosis. What is the approximate percentage of time these cells spend in mitosis?

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Question

A student observed onion root tip cells under a microscope. In a field of view containing 200 cells, 184 cells were in interphase and 16 cells were undergoing mitosis. What is the approximate percentage of time these cells spend in mitosis?

Accepted Answer

8% — Award 1 mark for correct calculation. Percentage of cells in mitosis = (16/200) × 100 = 8%. This represents the proportion of time spent in mitosis. B is incorrect — 16 is the number of cells, not the percentage. C is incorrect — this represents the percentage in interphase, not mitosis. D is incorrect — percentages cannot exceed 100%.

Answer

16%

Answer

92%

Answer

184%

Answer

8%

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