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Team 2
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Teams
Name
Score
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banana
Go to last place!
Oops!
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magnet
Take 25 points!
Okay!
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fairy
Take points!
5
10
15
20
25
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baam
Lose 25 points!
Oops!
15
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What did Van Helmont want to find out about plants?
Where their mass comes from
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15
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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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15
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Why was Van Helmont's conclusion only partly correct?
He didn’t know about carbon dioxide
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15
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What conclusion did Van Helmont make?
Plants gain mass from water
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15
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Which gas do plants actually use to gain most of their mass?
Carbon dioxide (CO₂)
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15
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True or False: Van Helmont thought soil was the main source of a plant’s mass.
False
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15
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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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seesaw
Swap points!
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star
Double points!
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gift
Win 10 points!
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baam
Lose 5 points!
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15
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How long did his experiment run?
5 years
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15
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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 key process (unknown at the time) explains how plants gain mass?
Photosynthesis
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15
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What did Van Helmont add to the plant besides soil?
Water
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baam
Lose 15 points!
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seesaw
Swap points!
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rocket
Go to first place!
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baam
Lose 20 points!
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trap
No points!
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gold
Win 50 points!
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fairy
Take points!
5
10
15
20
25
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baam
Lose 5 points!
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15
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What did Van Helmont grow in his experiment?
A willow tree
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