中三 生物試卷 (F3 Biology Past Paper)

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內容節錄：
Practical 2.3 (A) Observation of onion epidermal cells (book p.30)
Objectives:
1. To prepare temporary mounts of onion epidermal cells
2. To observe onion epidermal cells
Chapter 2- The cell as the basic unit of life
Magnification:
Area of specimen observed
Details of specimen
Brightness of image
small piece of
inner epidermis
Draw labelled low-power and high-power diagrams of onion epidermal cells in the space below. (4 marks)
low-power diagram: [at least 3 cells]
high-power diagram: [at least 3 cells]
Resemblance (R): 1 [shape, appearance of cell wall] Resemblance (R): 1 [shape, appearance of cell wall]
Label (any 2): (L): 1
Label (any 2): (L): 1
Magnification:
Steps of using light
microscope: p.15-16
(smaller/larger)
(more/less)
(brighter / dimmer)
1. Complete the table below to show the differences between observations at low-power and high-power
magnifications under a microscope.
(smaller / larger)
(more / less)
(brighter / dimmer)
F.3 Biology
2. Are the onion cells you observed green in color (before staining with iodine solution)? Explain. (2 marks)
Chapter 2- The cell as the basic unit of life
3. Complete the table below to show the two similarities and two differences between animal and plant
cells. (book p.32)
(Both of them have...)
Similarities:
Differences:
(Plant cell has/is... while animal cell has /is...) OR (Plant cell is ...than animal cell)