Page 14 - 新思维科学学生用书7 样章

1.2 Animal cells

Continued

8 Look down the eyepiece. Slowly turn the focussing knob to move the lens
upwards. Stop when you can see the cells.

9 Turn the lenses until a larger one is over the stage. Look down the eyepiece.
You should be able to see a more magnified view of the cells.
10 Make a drawing of one or two of the cells you can see. Label your drawing.

Questions

1 The photographs show some cells, seen through a microscope.

For each photograph, decide whether the cells are plant cells or animal cells. Explain your
decision.
2 Think about the model of a plant cell that you made.

What would you change to make it into a model of an animal cell?

Activity

Building up pictures of plant and animal cells

You will need:

• fifteen cut-out oval pieces of card or paper, each about 1 cm long, five
coloured red and ten coloured green
• one cut-out circular piece of grey card or paper, about 1 cm in diameter
• long pieces of string or wool
• a long piece of wide tape

• glue or double-sided sticky tape
• a very large sheet of paper

13