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Van Helmont

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  • Why was Van Helmont's conclusion only partly correct?
    He didn’t know about carbon dioxide
  • How much soil did Van Helmont find was lost after 5 years?
    Almost none (only a few grams)
  • What did Van Helmont want to find out about plants?
    Where their mass comes from
  • What conclusion did Van Helmont make?
    Plants gain mass from water
  • How long did his experiment run?
    5 years
  • What element in CO₂ becomes the main building block of plants?
    Carbon
  • What key process (unknown at the time) explains how plants gain mass?
    Photosynthesis
  • True or False: Van Helmont thought soil was the main source of a plant’s mass.
    False
  • What did Van Helmont grow in his experiment?
    A willow tree
  • Which gas do plants actually use to gain most of their mass?
    Carbon dioxide (CO₂)
  • What was one flaw in Van Helmont’s experiment?
    He didn’t account for gases / limited controls
  • What did Van Helmont add to the plant besides soil?
    Water
  • What changed more: the mass of the soil or the mass of the plant?
    The mass of the plant
  • What part of the plant did Van Helmont measure at the end?
    The tree’s mass
  • What modern scientific method did Van Helmont demonstrate?
    Careful measurement and controlled variables
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