Neco Model Questions Vol1 2021 Biology Question 1

Practice practical question 1 from the 2021 Neco Model Questions Vol1 Biology examination. This question covers Cell Structure, Microscopy, Measurement .

Neco Model Questions Vol1 2021 Biology Practical
Topics: Cell Structure Microscopy Measurement
Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • practical

A student prepares a temporary wet mount of an onion (Allium cepa) epidermal peel to observe cell structure under the microscope. The ocular micrometer has been calibrated with a stage micrometer such that 1 mm = 100 divisions.

Question Parts

( a )
List three distinct cell structures that can be clearly identified in the preparation and state one function for each.
( b )
The student measures the length of five adjacent cells as follows (in ocular divisions): 28, 30, 27, 31, 29. Calculate the average cell length in micrometres (µm). Show all steps.
( c )
Assuming the cells are approximately rectangular and the average width measured from the same field is 12 divisions, calculate the average cell area in µm². Then estimate how many such cells would be required to line up to cover a leaf surface area of 2.5 cm². (1 cm = 10,000 µm)
( d )
Identify two sources of error that could affect the accuracy of the measurements and suggest one precaution for each.

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About This Question

This is Neco Model Questions Vol1 2021 Biology Question 1. It is one of the practical questions from the 2021 Neco Model Questions Vol1 Biology examination.

The question covers Cell Structure, Microscopy, Measurement .

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