Thames & Kosmos Global Water Quality handleiding
Handleiding
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EXPERIMENT 5 SOS for the cress
1
Place a small piece of ripped-off
filter paper in each measuring cup,
sprinkle a few cress seeds and sand
on top, and moisten everything well. To help the
seeds sprout faster, set the lid on loosely. Place
them in a sunny location and be sure that the
seeds always stay moist.
Explanation:
The cress plants that were treated with salt or vinegar shrivel or
die. Dirty wastewater is just as harmful for animals and plants.
And without water, plants will very quickly dry up. Exceptions
to this rule are plants that are of a type that can thrive in dry
environments.
Vinegar and lemon juice are both what chemists call acids.
Why does so much effort have to be put into
cleaning wastewater?
You will need:
cress seeds, 3 small measuring cups, filter paper,
pipette, as well as: table salt, vinegar or lemon juice
Tip: Water the plants
with the pipette, then
you can find the correct
quantity of water!
2
After the plants have grown for
a few days, sprinkle a pinch of salt
into one of the measuring cups. To
the next cup, add a few drops of
vinegar or lemon juice. And simply
stop watering the plants in the third
measuring cup. What happens?
12
Global Water Quality Manual 2013.indd 12 2/7/13 10:22 AM
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Global Water Quality |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 3490 MB |
