Page 10 - Ranger PT3 2022 science

Science PT3 Chapter 2 Cell as the Basic Unit of Life

3. A drop of methylene blue solution is added to the Methylene blue
specimen. solution
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Glass
slide

4. The cover glass is slowly placed on top of the glass
slide using a mounting needle. (Ensure no air bubbles
get trapped on the slide). Cover Mounting
glass
needle

5. Excess methylene blue solution is absorbed using a Form 1
filter paper.
Form 1
Methylene
blue
solution Filter
paper
6. The slide is observed under a microscope using a
low-powered lens followed by a high-powered lens. A
labelled diagram containing a few cheek cells is drawn.

Observation:

Cytoplasm
Quiz
Quiz
Quiz
Quiz
Cell
Nucleus membrane Cheek cells do not have a regular
shape because they do not have
.
Diagram 2.3 Cheek cells
Discussion:
1. Methylene blue solution is used to stain the cheek cells so their structure
can be seen more clearly.
2. A cheek cell does not have a regular shape.
3. A cheek cell contains the nucleus, cell membrane and cytoplasm.
Conclusion:
Animal cells have an irregular shape and contain a nucleus, cell membrane and
cytoplasm.

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