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CAIE IGCSE Biology 2 Organisation of the Organism Questions

Practise identifying cell structures, linking specialised features to functions and calculating specimen size or magnification.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

2.1 Cell structure2.2 Size of specimens

Question 1

[Maximum number: 1]

Fig. 6.1 shows some cells from the shoot tip of an onion, Allium cepa.

Fig. 6.1

Fig. 6.1

State the evidence visible in Fig. 6.1 that identifies the cells of A. cepa as plant cells.

Question 2

[Maximum number: 2]

Bacteria are useful in biotechnology and genetic engineering.
Fig. 6.1 shows a photomicrograph of a bacterium.

Fig. 6.1

Fig. 6.1

Question (a)

(a)

Write the formula that would be used to calculate the actual width of the bacterium.

[ 1 ]

Question (b)

(b)

The actual width of the bacterium is 0.0008 mm .
Convert this value to micrometres (μm)(\mu \mathrm{m}).
. μm\mu \mathrm{m}

[ 1 ]

Question 3

[Maximum number: 2]

State two cell structures found in both animal and bacterial cells.
1
2

Question 4

[Maximum number: 1]

The diagram shows a magnified image of a human liver cell with a mitochondrion labelled. The actual size of the liver cell is 20μ m20 \mu \mathrm{~m}.

The image size of the liver cell is 40 mm and the image size of the mitochondrion is 4 mm .

Figure for Question 4 — CAIE IGCSE Biology

What is the actual size of the mitochondrion shown in the diagram?

A

0.002 mm0.002 \mathrm{~mm}

B

0.02 mm

C

0.2 mm0.2 \mathrm{~mm}

D

2 mm

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