Igcse Model Questions Vol1 2017 Biology Question 1

Practice practical question 1 from the 2017 Igcse Model Questions Vol1 Biology examination. This question covers Cell Structure .

Igcse Model Questions Vol1 2017 Biology Practical

Topic: Cell Structure

Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • practical

You are given a prepared slide of a thin transverse section of an onion (Allium cepa) epidermis. Using a light microscope equipped with an ocular micrometer (scale = 0.01 mm per division) and a calibrated stage micrometer (scale = 0.1 mm per division), you are to determine the average size of the cells and evaluate the surface‑area‑to‑volume ratio. The lengths and widths of five representative cells measured on the slide are given below (all measurements in millimetres).

Question Parts

( a )

Calculate the mean length and the mean width of the five cells.

( b )

Assuming a uniform thickness of 0.02 mm for all cells, calculate:

( c )

Determine the average surface‑area‑to‑volume ratio and comment on how this ratio influences the suitability of the cell for diffusion of nutrients.

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About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 1. It is one of the practical questions from the 2017 Igcse Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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