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Individual Pathways
Activity 3.2
Analysing cells
1.
doc-6049
Fill in the following table with ‘yes’ if the description is true and ‘no’ if it is not true.
Write ‘yes and no’ if the description is true for some but not all members of the kingdom.
(Hint: Look at the diagram of the kingdoms on page 69 of Science Quest 8.)
Description
Prokaryotae
Protoctista
Fungi
Plantae
Animalia
Cells have a cell wall.
Cells have chloroplasts.
Cells can move around by
themselves.
Organisms are
multicellular.
Organisms can make their
own food (autotrophic).
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2.
A 1-mm-square grid was examined using a light microscope under low magnification. The
grid appeared as shown in figure 1. Figure 2 shows a plant cell that is 500 µm
(micrometres) long.
Figure 1 Figure 2
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Activity 3.2
(a) Name the four structures (A, B, C and D) in figure 2.
A: ....................... B: ....................... C: ....................... D: .......................
(b) Given that 1 m = 1 000 000 μm, calculate the number of micrometres in 1 mm.
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(c) Figure 1 shows a 1-mm grid viewed under low magnification.
i. What is the distance in millimetres between X and Y?
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ii. The diameter of the field of view is the distance between X and Y. Calculate the
diameter of the field of view in micrometres between X and Y.
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iii. The plant cell in figure 2 is 500 µm long. How many of these plant cells would fit
arranged end to end across the field of view?
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iv. Draw the cells in part (iii) on figure 1.
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3.
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Match the descriptions of these five plant cell types with the diagrams below.
Cell type
Description
Diagram
Leaf cells
(palisade cells)
Pallisade mesophyll cells undergo photosynthesis, which provides the
plant with the energy.
Guard cells
Guard cells are kidney-shaped cells found on the surface of leaves. The
small holes between the guard cells are called stomata.
Epidermal cells
Onion epidermal cells provide layers of protection for the sensitive
tissues underneath. These cells do not undergo photosynthesis.
Phloem cells
Phloem cells form tubes. The ends of phloem cells have holes and look
like sieves.
Xylem cells
Xylem cells form xylem tubes. They have thick cell walls with lots of
cellulose.
A
B
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C
2
D
E
Activity 3.2
4.
Examine the drawings of the animal tissues shown below.
(a) Each of these tissues is made up of a large number of cells. For any one tissue, what do
you notice about the cells within that tissue?
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(b) Describe one function of each of these three tissue types. Lung epithelium tissue:
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Muscle tissue:
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Skin tissue:
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