History of Photosynthesis

Bingo!

• Flame, Oxygen, Water, Soil, Plants, Carbon dioxide, Photosynthesis, Jan Ingenhousz, Joseph Priestly, energy, Jan Baptist van Helmont, Sunlight, Autotroph, Heterotroph, sugar, mass, jar, experiment
• Fill out your cards using every word. You may have to use some words more than once.

Heterotroph:
organism that cannot make their own food and must rely on energy from food

Autotroph

• Organism that uses sunlight energy to make its own chemical energy.

Where do plants get their mass from?

Where do plants get their energy from?

6CO2 + 6H2O--> C6H12O6 + 6O2

Jan Baptist van Helmont

• Observed that plants grow in soil.
• Hypothesized that plants got their mass from the soil.

John Woodward
Measured the amount of water that plants absorbed. Although the plant absorbed 75,000 grams of water, it only increased by 1 gram in mass.

6CO2 + 6H2O--> C6H12O6 + 6O2

Lab Time

Why did the flame burn out?

Joseph Priestly

• Priestly discovered that burning a candle would "injure" the air. This made it impossible to support life.

Joseph Priestly

• However, plants had the power to "heal" the air.
• They counteracted the candle and allowed life to be supported.

Jan Ingenhousz

• Ingenhousz expanded on Priestley's experiment. He found that light was needed for plants to "heal" the air. In fact, without light, plants "injured" the air the same as animals.

6CO2 + 6H2O--> C6H12O6 + 6O2

Quiz Time