Thames & Kosmos Kids First: Biology Lab handleiding

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Thames & Kosmos

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Handleiding

Detectives on the Trail

EXPERIMENT 8

EXPLANATION

Each fiber reveals its own unique details

under the microscope. Hairs from fabric

fibers are easy to tell apart. With a little

practice, you will be able to see the

difference between cotton fibers and

silk, or between the hairs of various

living things. The prepared slide will

give you some idea how your crime

scene samples will look under the

microscope.

Horse hair

Cat hair

Dog hair

Rabbit hair

Human hairs

Refrigerator

detectives: Who was

the perpetrator?

YOU WILL NEED

› Slides, cover slips, pipette, sample container,

tweezers, “natural fibers” prepared slide

› Water, various hair and fiber samples (from

around the house), small plastic bags (reseal-

able), 1 permanent marker (for identifying the

bags and slides)

HERE‘S HOW

1. Prepare several slides by placing a drop of

water onto the center of each one with the

pipette.

2. Set the hairs or fibers in the water droplets,

place a cover slip on top of each, and study

the samples using the smallest objective lens.

Then try the lens with medium magnification,

followed by the one with the greatest

magnification, which will let you see the fiber

structures most clearly.

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