Neco Model Questions Vol1 2023 Biology Question 1

Practice practical question 1 from the 2023 Neco Model Questions Vol1 Biology examination. This question covers Cell Structure .

Neco Model Questions Vol1 2023 Biology Practical
Topic: Cell Structure
Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • practical

A fresh onion (Allium cepa) leaf was prepared for microscopic observation using a slide‑preparation technique. The slide was examined under a compound microscope with a 10× ocular lens and a 40× objective lens. The ocular micrometer was calibrated as 0.01 mm per division. The student recorded the following measurements of five parenchyma cells (length × width in micrometer divisions): Cell 1: 45 × 30 Cell 2: 48 × 28 Cell 3: 44 × 32 Cell 4: 46 × 31 Cell 5: 47 × 29 The textbook states that the typical area of an onion epidermal cell is 0.14 mm².

Question Parts

( a )
Calculate the average length and the average width of the cells in millimetres (mm).
( b )
Assuming the cells are approximately rectangular, calculate the average cell area in mm² using the averages obtained in part (a).
( c )
Compare your calculated average area with the textbook value (0.14 mm²). State the difference and give two possible reasons for any discrepancy.
( d )
List two precautions that should be observed while preparing the slide to minimise distortion of cell dimensions.

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About This Question

This is Neco Model Questions Vol1 2023 Biology Question 1. It is one of the practical questions from the 2023 Neco Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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