Thames & Kosmos Kids First: Biology Lab handleiding

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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.

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.

While some polyps are visible with the

naked eye — some are up to 2.5 cm long

— their prey can only be seen under the

microscope.

The World of Microbes

in Our Water Systems

Gateway to the Microcosm

TIP!

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.

“Hydra” freshwater polyp

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