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15
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What conclusion did Van Helmont make?
Plants gain mass from water
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Which gas do plants actually use to gain most of their mass?
Carbon dioxide (CO₂)
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What did Van Helmont want to find out about plants?
Where their mass comes from
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Why was Van Helmont's conclusion only partly correct?
He didn’t know about carbon dioxide
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thief
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25
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magnet
Take 20 points!
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gift
Win 25 points!
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thief
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What changed more: the mass of the soil or the mass of the plant?
The mass of the plant
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What did Van Helmont add to the plant besides soil?
Water
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What was one flaw in Van Helmont’s experiment?
He didn’t account for gases / limited controls
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What element in CO₂ becomes the main building block of plants?
Carbon
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What did Van Helmont grow in his experiment?
A willow tree
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How much soil did Van Helmont find was lost after 5 years?
Almost none (only a few grams)
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What modern scientific method did Van Helmont demonstrate?
Careful measurement and controlled variables
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thief
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gift
Win 15 points!
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fairy
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banana
Go to last place!
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heart
Other team wins 25 points!
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seesaw
Swap points!
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shark
Other team loses 20 points!
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thief
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What part of the plant did Van Helmont measure at the end?
The tree’s mass
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How long did his experiment run?
5 years
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