Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding
Handleiding
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Gateway to the Microcosmos
What’s living in
the pond?
The creatures living in puddles and ponds
live in all kinds of ways and in all kinds of
places. Algae usually float freely in the
water in order to get as close as possible to
the light. Water fleas paddle themselves
around and use their legs to filter out algae and
microorganisms. Some animals can be seen with the
naked eye, while others are only visible under the
microscope.
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First study the water samples with your naked
eye. A lot of specimens, such as water fleas and
some diatoms, can easily be seen without
magnification. If your water sample is very
cloudy, just let it sit for a while. Fine sand or silt
particles will settle to the bottom of the sample
vessel. Then you will be able to see the freely
swimming creatures quite easily, and you can
suction them up with the pipette and place them
on your slide for observation.
Freshwater polyp,
“Hydra”
A fearsome pond predator you
might find is a freshwater polyp called
a hydra. It has tentacles that it uses to
fish for food, and it also possesses tiny,
poison-tipped harpoons with which it
shoots its prey upon contact, wounding
or killing it. It would be quite scary to
humans if it were a lot bigger! While
some polyps are visible with the naked
eye — some are up to 2.5 cm (1 inch) long
— their prey are so small that they can
only be seen under the microscope.
Hydra
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Kids First: Biology Lab (V 2.0) |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 24679 MB |
