experiments by Van Helmont, Joseph Priestly, and Ingenhousz

- helped to pave the way for the unraveling of photosynthesis. • Photosynthesis is the process by which plants produce their own food.

- organisms that can synthesize their own food

- organisms that must take in food from outside sources

- In the seventeenth century Van Helmont planted a willow tree in a tub. After five years he calculated that the willow tree gained 164 pounds. He also calculated that the soil had lost two ounces. - From his research, Van Helmont concluded that water was involved in the conversion of abiotic (H2O) material to biotic materials (plant tissues).

- was a clergyman who performed photosynthesis experiments. He placed a mouse in a lidded empty jar. The mouse died because there was no oxygen available. When a mouse was placed in a jar with a plant, it lived. - From is experiment, he concluded that plants must be able to produce oxygen; thus plants are able to take in water and form organic materials and oxygen.

- found that plants give off oxygen in the presence of light. He also found that in the dark, plants give off some carbon dioxide (CO2). - Plants must therefore somehow use water and light to build plant material and give off oxygen.

Joseph Priestly discovered that

- the gas that a mouse removes from the air is produced by plants

5.1.1 The Unraveling of Photosynthesis: A Historical Perspective Flashcards by Irina Soloshenko

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5.1.1 The Unraveling of Photosynthesis: A Historical Perspective Flashcards

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