Thames & Kosmos Kids First: Biology Lab handleiding

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Handleiding

EXPERIMENT 4

Waterweed

chloroplasts

YOU WILL NEED

› 1 Slide, 1 cover slip, pipette, tweezers

› 1 Piece of blotting paper (or paper towel), 1

waterweed leaf, water

HERE’S HOW

1. Prepare the slide as already described in the

onion skin experiment (Experiment 3).

2. Use the tweezers to place the leaf in the

water droplet, and cover everything with a

cover slip.

EXPLANATION

The individual chloroplasts are easy to

spot inside the cells. They are constantly

in motion under the bright light of the

lamp. The green chlorophyll plant

pigment is important for

manufacturing sugar and starch,

which it does with the help of sunlight.

TIP!

Most leaves consist of several layers of

cells. That is why you first have to cut

these specimens in order to get layer

thin enough for the light of the

microscope to penetrate. Before

practicing your cutting technique in the

next chapter, try finding other types of

plants with similarly simple tissue

structures. Moss leaves are ideal for

this. Or try “peeling off” thin layers

from the surface of other plant leaves,

such as cabbage or lettuce leaves (close

to the stalk), or from the stems of cut

flowers (e.g., tulips, gerber daisies), or

the skin of a tomato.

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