Neco 2021 Biology Question 1

Practice practical question 1 from the 2021 Neco Biology examination. This question covers Cell Structure .

Neco 2021 Biology Practical
Topic: Cell Structure
Question 1 NECO • 2021 • BIOLOGY • practical

A fresh sample of onion (Allium cepa) epidermal tissue is to be examined under a light microscope to study the cell structure.

Question Parts

( a )
Describe the complete procedure for preparing a temporary slide of the onion epidermis suitable for observation under the microscope.
( b )
The microscope is fitted with a 10× ocular lens and a 40× objective lens. The scale in the eyepiece reticle indicates that 1 mm on the slide corresponds to 0.025 mm in the actual specimen. If a distance of 2.5 cm is measured on the reticle, calculate the actual length represented in the specimen.
( c )
Identify three distinct cellular structures that can be clearly seen in the prepared slide and state one function for each.
( d )
The student notes that some cells appear to have a relatively thicker cell wall than others. Propose two plausible reasons for this observation, considering the nature of the tissue and the preparation technique.

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About This Question

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

The question covers Cell Structure .

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