中三 生物試卷 (F3 Biology Past Paper)

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內容節錄：
F.3 Biology
Practical 2.3 (A) Observation of onion epidermal cells (book p.30)
Part II: Observation of onion epidermal cells
Objectives:
1. To prepare temporary mounts of onion epidermal cells
2. To observe onion epidermal cells
line, nucleus]
Label (any 2): (L): 1
Chapter 2- The cell as the basic unit of life
Area of specimen observed
Details of specimen
Brightness of image
Draw labelled low-power and high-power diagrams of onion epidermal cells in the space below. (4 marks)
Resemblance (R): 1 [shape, cell wall in one single
Resemblance (R): 1 [shape, cell wall in a layer,
Magnification: 10 x 10 = 100x
small piece of
inner epidermis
Label (any 2): (L): 1
Steps of using light
microscope: p.15-16
(small/ large)
(more / less)
(bright/ dim)
Magnification: 10 x 40
-cell membrane
1. Complete the table below to show the differences between observations at low power and high
power magnifications under a microscope.
(small/ large)
(more/less)
(bright/ dim)
F.3 Biology
2. Are the onion cells you observed green in color (before staining with iodine solution)? Explain. (2 marks)
The onion epidermal cells do not contain chloroplasts.
3. Complete the table below to show the two similarities and two differences between animal and plant
Similarities:
Differences:
Chapter 2-The cell as the basic unit of life
Both of them have a nucleus, a cell membrane and cytoplasm.
1. Plant cells are often larger than animal cells.
2. Plant cells have a more regular shape than animal cells
3. Plant cells have a thick cell wall and some have chloroplasts while animal cells do
Plant cells usually have a large vacuole while animal cells do not.
(other reasonable answers)